Vulnerability-Lookup

CVE-2026-49754 (GCVE-0-2026-49754)

Vulnerability from cvelistv5 – Published: 2026-06-02 14:15 – Updated: 2026-06-02 19:14

Title

HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation

Summary

Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood). When Mint's HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, the unparsed header-block fragment is parked in conn.headers_being_processed, and every subsequent CONTINUATION frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no CONTINUATION frame-count limit, and max_header_list_size is only enforced on outgoing requests, never on inbound header blocks (its default is :infinity). A malicious or compromised HTTP/2 server can stream an endless sequence of CONTINUATION frames (each up to the peer-advertised SETTINGS_MAX_FRAME_SIZE) and drive the client's iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient. This issue affects mint: from 0.1.0 before 1.9.0.

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-02 18:08 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

EEF mitre root Scorecard

References

4 references

URL	Tags
https://github.com/elixir-mint/mint/security/advi…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-49754.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-49754	related
https://github.com/elixir-mint/mint/commit/b662d1…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
elixir-mint	mint	Affected: 0.1.0 , < 1.9.0 (semver) cpe:2.3:a:elixir-mint:mint::::::::
elixir-mint	mint	Affected: 596ca4304504be68939c4929e0831557097962b8 , < b662d127d3028b5426c88d4c9cc7fe430491a10b (git) cpe:2.3:a:elixir-mint:mint::::::::

Credits

Peter Ullrich Eric Meadows-Jönsson Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-49754",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-02T18:08:02.308938Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-02T18:08:05.621Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mint.HTTP2\u0027"
          ],
          "packageName": "mint",
          "packageURL": "pkg:hex/mint",
          "product": "mint",
          "programFiles": [
            "lib/mint/http2.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
            },
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "1.9.0",
              "status": "affected",
              "version": "0.1.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mint.HTTP2\u0027"
          ],
          "packageName": "elixir-mint/mint",
          "packageURL": "pkg:github/elixir-mint/mint",
          "product": "mint",
          "programFiles": [
            "lib/mint/http2.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
            },
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint.git",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "b662d127d3028b5426c88d4c9cc7fe430491a10b",
              "status": "affected",
              "version": "596ca4304504be68939c4929e0831557097962b8",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "1.9.0",
                  "versionStartIncluding": "0.1.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "AND"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Peter Ullrich"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Eric Meadows-J\u00f6nsson"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Jonatan M\u00e4nnchen / EEF"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).\u003cp\u003eWhen Mint\u0027s HTTP/2 receive path observes a \u003ctt\u003eHEADERS\u003c/tt\u003e frame without the \u003ctt\u003eEND_HEADERS\u003c/tt\u003e flag, the unparsed header-block fragment is parked in \u003ctt\u003econn.headers_being_processed\u003c/tt\u003e, and every subsequent \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame-count limit, and \u003ctt\u003emax_header_list_size\u003c/tt\u003e is only enforced on outgoing requests, never on inbound header blocks (its default is \u003ctt\u003e:infinity\u003c/tt\u003e).\u003c/p\u003e\u003cp\u003eA malicious or compromised HTTP/2 server can stream an endless sequence of \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames (each up to the peer-advertised \u003ctt\u003eSETTINGS_MAX_FRAME_SIZE\u003c/tt\u003e) and drive the client\u0027s iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\u003c/p\u003e\u003cp\u003eThis issue affects mint: from 0.1.0 before 1.9.0.\u003c/p\u003e"
            }
          ],
          "value": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).\n\nWhen Mint\u0027s HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, the unparsed header-block fragment is parked in conn.headers_being_processed, and every subsequent CONTINUATION frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no CONTINUATION frame-count limit, and max_header_list_size is only enforced on outgoing requests, never on inbound header blocks (its default is :infinity).\n\nA malicious or compromised HTTP/2 server can stream an endless sequence of CONTINUATION frames (each up to the peer-advertised SETTINGS_MAX_FRAME_SIZE) and drive the client\u0027s iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\n\nThis issue affects mint: from 0.1.0 before 1.9.0."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-130",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-130 Excessive Allocation"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-02T19:14:33.100Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "related"
          ],
          "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-49754.html"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49754"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eRestrict Mint to HTTP/1 on connections to untrusted servers by passing \u003ctt\u003eprotocols: [:http1]\u003c/tt\u003e to \u003ctt\u003e\u0027Elixir.Mint.HTTP\u0027:connect/4\u003c/tt\u003e. This avoids the vulnerable HTTP/2 receive path entirely, at the cost of losing HTTP/2 for those connections.\u003c/p\u003e"
            }
          ],
          "value": "Restrict Mint to HTTP/1 on connections to untrusted servers by passing protocols: [:http1] to Mint.HTTP.connect/4. This avoids the vulnerable HTTP/2 receive path entirely, at the cost of losing HTTP/2 for those connections."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-49754",
    "datePublished": "2026-06-02T14:15:14.951Z",
    "dateReserved": "2026-06-01T13:45:22.448Z",
    "dateUpdated": "2026-06-02T19:14:33.100Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-49754",
      "date": "2026-10-01",
      "epss": "0.00524",
      "percentile": "0.42319"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "collectionURL": "https://repo.hex.pm",
                "cpes": [
                  "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unaffected",
                "modules": [
                  "\u0027Elixir.Mint.HTTP2\u0027"
                ],
                "packageName": "mint",
                "packageURL": "pkg:hex/mint",
                "product": "mint",
                "programFiles": [
                  "lib/mint/http2.ex"
                ],
                "programRoutines": [
                  {
                    "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
                  },
                  {
                    "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
                  }
                ],
                "repo": "https://github.com/elixir-mint/mint",
                "vendor": "elixir-mint",
                "versions": [
                  {
                    "lessThan": "1.9.0",
                    "status": "affected",
                    "version": "0.1.0",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "collectionURL": "https://github.com",
                "cpes": [
                  "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unaffected",
                "modules": [
                  "\u0027Elixir.Mint.HTTP2\u0027"
                ],
                "packageName": "elixir-mint/mint",
                "packageURL": "pkg:github/elixir-mint/mint",
                "product": "mint",
                "programFiles": [
                  "lib/mint/http2.ex"
                ],
                "programRoutines": [
                  {
                    "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
                  },
                  {
                    "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
                  }
                ],
                "repo": "https://github.com/elixir-mint/mint.git",
                "vendor": "elixir-mint",
                "versions": [
                  {
                    "lessThan": "b662d127d3028b5426c88d4c9cc7fe430491a10b",
                    "status": "affected",
                    "version": "596ca4304504be68939c4929e0831557097962b8",
                    "versionType": "git"
                  }
                ]
              }
            ],
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).\n\nWhen Mint\u0027s HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, the unparsed header-block fragment is parked in conn.headers_being_processed, and every subsequent CONTINUATION frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no CONTINUATION frame-count limit, and max_header_list_size is only enforced on outgoing requests, never on inbound header blocks (its default is :infinity).\n\nA malicious or compromised HTTP/2 server can stream an endless sequence of CONTINUATION frames (each up to the peer-advertised SETTINGS_MAX_FRAME_SIZE) and drive the client\u0027s iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\n\nThis issue affects mint: from 0.1.0 before 1.9.0."
          },
          {
            "lang": "es",
            "value": "La vulnerabilidad de asignaci\u00f3n de recursos sin l\u00edmites ni limitaci\u00f3n en elixir-mint Mint permite a los servidores HTTP/2 controlados por el atacante agotar la memoria en un cliente Mint (inundaci\u00f3n de CONTINUATION de HTTP/2).\n\nCuando la ruta de recepci\u00f3n HTTP/2 de Mint observa un frame HEADERS sin el flag END_HEADERS, el fragmento de bloque de encabezado no analizado se estaciona en conn.headers_being_processed, y cada frame CONTINUATION subsiguiente en ese flujo se a\u00f1ade al acumulador. Nada en la ruta de recepci\u00f3n limita el acumulador: no hay un l\u00edmite de tama\u00f1o por flujo, ning\u00fan l\u00edmite de conteo de frames CONTINUATION, y max_header_list_size solo se aplica a las solicitudes salientes, nunca a los bloques de encabezado entrantes (su valor predeterminado es :infinity).\n\nUn servidor HTTP/2 malicioso o comprometido puede transmitir una secuencia interminable de frames CONTINUATION (cada uno hasta el SETTINGS_MAX_FRAME_SIZE anunciado por el par) y llevar el iolist del cliente a un tama\u00f1o arbitrario, causando agotamiento de memoria y la muerte del proceso BEAM. Una sola conexi\u00f3n a un endpoint HTTP/2 controlado por el atacante es suficiente.\n\nEste problema afecta a mint: desde 0.1.0 antes de 1.9.0."
          }
        ],
        "id": "CVE-2026-49754",
        "lastModified": "2026-07-22T19:10:00.120",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 8.2,
                "baseSeverity": "HIGH",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-49754",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-02T18:08:02.308938Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-06-02T16:16:44.930",
        "references": [
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "url": "https://cna.erlef.org/cves/CVE-2026-49754.html"
          },
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "url": "https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b"
          },
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
          },
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49754"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
          }
        ],
        "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-770"
              }
            ],
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-06-05T19:19:19+00:00",
      "cve": "CVE-2026-49754",
      "id": "CVE-2026-49754",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49754.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-49754",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-02T18:08:02.308938Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-02T18:07:25.237Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://repo.hex.pm",
              "cpes": [
                "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.Mint.HTTP2\u0027"
              ],
              "packageName": "mint",
              "packageURL": "pkg:hex/mint",
              "product": "mint",
              "programFiles": [
                "lib/mint/http2.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
                },
                {
                  "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
                }
              ],
              "repo": "https://github.com/elixir-mint/mint",
              "vendor": "elixir-mint",
              "versions": [
                {
                  "lessThan": "1.9.0",
                  "status": "affected",
                  "version": "0.1.0",
                  "versionType": "semver"
                }
              ]
            },
            {
              "collectionURL": "https://github.com",
              "cpes": [
                "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.Mint.HTTP2\u0027"
              ],
              "packageName": "elixir-mint/mint",
              "packageURL": "pkg:github/elixir-mint/mint",
              "product": "mint",
              "programFiles": [
                "lib/mint/http2.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
                },
                {
                  "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
                }
              ],
              "repo": "https://github.com/elixir-mint/mint.git",
              "vendor": "elixir-mint",
              "versions": [
                {
                  "lessThan": "b662d127d3028b5426c88d4c9cc7fe430491a10b",
                  "status": "affected",
                  "version": "596ca4304504be68939c4929e0831557097962b8",
                  "versionType": "git"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "1.9.0",
                      "versionStartIncluding": "0.1.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ],
              "operator": "AND"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Peter Ullrich"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Eric Meadows-J\u00f6nsson"
            },
            {
              "lang": "en",
              "type": "analyst",
              "value": "Jonatan M\u00e4nnchen / EEF"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).\u003cp\u003eWhen Mint\u0027s HTTP/2 receive path observes a \u003ctt\u003eHEADERS\u003c/tt\u003e frame without the \u003ctt\u003eEND_HEADERS\u003c/tt\u003e flag, the unparsed header-block fragment is parked in \u003ctt\u003econn.headers_being_processed\u003c/tt\u003e, and every subsequent \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame-count limit, and \u003ctt\u003emax_header_list_size\u003c/tt\u003e is only enforced on outgoing requests, never on inbound header blocks (its default is \u003ctt\u003e:infinity\u003c/tt\u003e).\u003c/p\u003e\u003cp\u003eA malicious or compromised HTTP/2 server can stream an endless sequence of \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames (each up to the peer-advertised \u003ctt\u003eSETTINGS_MAX_FRAME_SIZE\u003c/tt\u003e) and drive the client\u0027s iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\u003c/p\u003e\u003cp\u003eThis issue affects mint: from 0.1.0 before 1.9.0.\u003c/p\u003e"
                }
              ],
              "value": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).\n\nWhen Mint\u0027s HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, the unparsed header-block fragment is parked in conn.headers_being_processed, and every subsequent CONTINUATION frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no CONTINUATION frame-count limit, and max_header_list_size is only enforced on outgoing requests, never on inbound header blocks (its default is :infinity).\n\nA malicious or compromised HTTP/2 server can stream an endless sequence of CONTINUATION frames (each up to the peer-advertised SETTINGS_MAX_FRAME_SIZE) and drive the client\u0027s iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\n\nThis issue affects mint: from 0.1.0 before 1.9.0."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-130",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-130 Excessive Allocation"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 8.2,
                "baseSeverity": "HIGH",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-770",
                  "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-02T19:14:33.100Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "related"
              ],
              "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-49754.html"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49754"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eRestrict Mint to HTTP/1 on connections to untrusted servers by passing \u003ctt\u003eprotocols: [:http1]\u003c/tt\u003e to \u003ctt\u003e\u0027Elixir.Mint.HTTP\u0027:connect/4\u003c/tt\u003e. This avoids the vulnerable HTTP/2 receive path entirely, at the cost of losing HTTP/2 for those connections.\u003c/p\u003e"
                }
              ],
              "value": "Restrict Mint to HTTP/1 on connections to untrusted servers by passing protocols: [:http1] to Mint.HTTP.connect/4. This avoids the vulnerable HTTP/2 receive path entirely, at the cost of losing HTTP/2 for those connections."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-49754",
        "datePublished": "2026-06-02T14:15:14.951Z",
        "dateReserved": "2026-06-01T13:45:22.448Z",
        "dateUpdated": "2026-06-02T19:14:33.100Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-49754

Vulnerability from fkie_nvd - Published: 2026-06-02 16:16 - Updated: 2026-07-22 19:10

Severity

8.2 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-49754.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-49754
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mint.HTTP2\u0027"
          ],
          "packageName": "mint",
          "packageURL": "pkg:hex/mint",
          "product": "mint",
          "programFiles": [
            "lib/mint/http2.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
            },
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "1.9.0",
              "status": "affected",
              "version": "0.1.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mint.HTTP2\u0027"
          ],
          "packageName": "elixir-mint/mint",
          "packageURL": "pkg:github/elixir-mint/mint",
          "product": "mint",
          "programFiles": [
            "lib/mint/http2.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
            },
            {
              "name": "\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint.git",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "b662d127d3028b5426c88d4c9cc7fe430491a10b",
              "status": "affected",
              "version": "596ca4304504be68939c4929e0831557097962b8",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).\n\nWhen Mint\u0027s HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, the unparsed header-block fragment is parked in conn.headers_being_processed, and every subsequent CONTINUATION frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no CONTINUATION frame-count limit, and max_header_list_size is only enforced on outgoing requests, never on inbound header blocks (its default is :infinity).\n\nA malicious or compromised HTTP/2 server can stream an endless sequence of CONTINUATION frames (each up to the peer-advertised SETTINGS_MAX_FRAME_SIZE) and drive the client\u0027s iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\n\nThis issue affects mint: from 0.1.0 before 1.9.0."
    },
    {
      "lang": "es",
      "value": "La vulnerabilidad de asignaci\u00f3n de recursos sin l\u00edmites ni limitaci\u00f3n en elixir-mint Mint permite a los servidores HTTP/2 controlados por el atacante agotar la memoria en un cliente Mint (inundaci\u00f3n de CONTINUATION de HTTP/2).\n\nCuando la ruta de recepci\u00f3n HTTP/2 de Mint observa un frame HEADERS sin el flag END_HEADERS, el fragmento de bloque de encabezado no analizado se estaciona en conn.headers_being_processed, y cada frame CONTINUATION subsiguiente en ese flujo se a\u00f1ade al acumulador. Nada en la ruta de recepci\u00f3n limita el acumulador: no hay un l\u00edmite de tama\u00f1o por flujo, ning\u00fan l\u00edmite de conteo de frames CONTINUATION, y max_header_list_size solo se aplica a las solicitudes salientes, nunca a los bloques de encabezado entrantes (su valor predeterminado es :infinity).\n\nUn servidor HTTP/2 malicioso o comprometido puede transmitir una secuencia interminable de frames CONTINUATION (cada uno hasta el SETTINGS_MAX_FRAME_SIZE anunciado por el par) y llevar el iolist del cliente a un tama\u00f1o arbitrario, causando agotamiento de memoria y la muerte del proceso BEAM. Una sola conexi\u00f3n a un endpoint HTTP/2 controlado por el atacante es suficiente.\n\nEste problema afecta a mint: desde 0.1.0 antes de 1.9.0."
    }
  ],
  "id": "CVE-2026-49754",
  "lastModified": "2026-07-22T19:10:00.120",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-49754",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-02T18:08:02.308938Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-02T16:16:44.930",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-49754.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49754"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

GHSA-2P26-P43X-FHP8

Vulnerability from github – Published: 2026-07-09 23:19 – Updated: 2026-07-09 23:19

Summary

mint: Unbounded CONTINUATION/HEADERS frame accumulation (CONTINUATION flood)

Details

Summary

Mint's HTTP/2 client accumulates CONTINUATION header-block fragments into a per-connection buffer with no cap on size or frame count. A malicious or compromised HTTP/2 server can drive the client's memory to arbitrary size by streaming an endless chain of CONTINUATION frames after a HEADERS frame that omits END_HEADERS, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.

Details

When Mint's HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, 'Elixir.Mint.HTTP2':handle_headers/3 parks the unparsed header-block fragment in conn.headers_being_processed. Every subsequent CONTINUATION frame on that stream is then appended to the accumulator by 'Elixir.Mint.HTTP2':handle_continuation/3.

Nothing in the receive path bounds this accumulator: there is no per-stream size cap, no CONTINUATION frame-count cap, and max_header_list_size is only enforced on outgoing requests (its default is :infinity, and the only enforcement helper inspects server_settings for request encoding, never inbound header blocks). Each CONTINUATION payload can be up to the peer-advertised SETTINGS_MAX_FRAME_SIZE, so the attacker can grow headers_being_processed to arbitrary size at line rate.

PoC

Stand up a raw TCP server that speaks the HTTP/2 handshake.
After the client's request HEADERS arrives, respond with a HEADERS frame on stream 1 with flags = 0 (no END_HEADERS, no END_STREAM) and an empty header-block fragment.
Stream CONTINUATION frames on stream 1, each with flags = 0 and a payload up to SETTINGS_MAX_FRAME_SIZE. Never set END_HEADERS.
The client's process memory grows linearly with the flood and the BEAM process eventually crashes with OOM.

Impact

Remote, unauthenticated denial-of-service against any process using Mint as an HTTP/2 client against an untrusted or attacker-influenced server. A single connection is sufficient to drive memory to arbitrary size and crash the BEAM process. The default Mint configuration is vulnerable; no client-side opt-in is required. Scored CVSS v4.0 8.2 (HIGH).

Workarounds

Restrict Mint to HTTP/1 on connections to untrusted servers by passing protocols: [:http1] to 'Elixir.Mint.HTTP':connect/4. This avoids the vulnerable HTTP/2 receive path entirely, at the cost of losing HTTP/2 for those connections.

Resources

Introduction commit: https://github.com/elixir-mint/mint/commit/596ca4304504be68939c4929e0831557097962b8
Patch commit: https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b

Severity

8.2 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Hex",
        "name": "mint"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49754"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-09T23:19:23Z",
    "nvd_published_at": "2026-06-02T16:16:44Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nMint\u0027s HTTP/2 client accumulates `CONTINUATION` header-block fragments into a per-connection buffer with no cap on size or frame count. A malicious or compromised HTTP/2 server can drive the client\u0027s memory to arbitrary size by streaming an endless chain of `CONTINUATION` frames after a `HEADERS` frame that omits `END_HEADERS`, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\n\n### Details\n\nWhen Mint\u0027s HTTP/2 receive path observes a `HEADERS` frame without the `END_HEADERS` flag, `\u0027Elixir.Mint.HTTP2\u0027:handle_headers/3` parks the unparsed header-block fragment in `conn.headers_being_processed`. Every subsequent `CONTINUATION` frame on that stream is then appended to the accumulator by `\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3`.\n\nNothing in the receive path bounds this accumulator: there is no per-stream size cap, no `CONTINUATION` frame-count cap, and `max_header_list_size` is only enforced on outgoing requests (its default is `:infinity`, and the only enforcement helper inspects `server_settings` for request encoding, never inbound header blocks). Each `CONTINUATION` payload can be up to the peer-advertised `SETTINGS_MAX_FRAME_SIZE`, so the attacker can grow `headers_being_processed` to arbitrary size at line rate.\n\n### PoC\n\n1. Stand up a raw TCP server that speaks the HTTP/2 handshake.\n2. After the client\u0027s request `HEADERS` arrives, respond with a `HEADERS` frame on stream 1 with `flags = 0` (no `END_HEADERS`, no `END_STREAM`) and an empty header-block fragment.\n3. Stream `CONTINUATION` frames on stream 1, each with `flags = 0` and a payload up to `SETTINGS_MAX_FRAME_SIZE`. Never set `END_HEADERS`.\n4. The client\u0027s process memory grows linearly with the flood and the BEAM process eventually crashes with OOM.\n\n### Impact\n\nRemote, unauthenticated denial-of-service against any process using Mint as an HTTP/2 client against an untrusted or attacker-influenced server. A single connection is sufficient to drive memory to arbitrary size and crash the BEAM process. The default Mint configuration is vulnerable; no client-side opt-in is required. Scored CVSS v4.0 8.2 (HIGH).\n\n## Workarounds\n\nRestrict Mint to HTTP/1 on connections to untrusted servers by passing `protocols: [:http1]` to `\u0027Elixir.Mint.HTTP\u0027:connect/4`. This avoids the vulnerable HTTP/2 receive path entirely, at the cost of losing HTTP/2 for those connections.\n\n## Resources\n\n* Introduction commit: https://github.com/elixir-mint/mint/commit/596ca4304504be68939c4929e0831557097962b8\n* Patch commit: https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b",
  "id": "GHSA-2p26-p43x-fhp8",
  "modified": "2026-07-09T23:19:23Z",
  "published": "2026-07-09T23:19:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49754"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-49754.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/elixir-mint/mint"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49754"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "mint: Unbounded CONTINUATION/HEADERS frame accumulation (CONTINUATION flood)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-49754 (GCVE-0-2026-49754)

FKIE_CVE-2026-49754

GHSA-2P26-P43X-FHP8

Summary

Details

PoC

Impact

Workarounds

Resources

Tags

Sightings

Nomenclature

Related by attack behaviour