Vulnerability-Lookup

CVE-2026-59246 (GCVE-0-2026-59246)

Vulnerability from cvelistv5 – Published: 2026-07-14 08:37 – Updated: 2026-07-14 15:08

Title

Zero-length HTTP/2 CONTINUATION frames bypass Mint's header-block byte-size cap and exhaust client memory

Summary

Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service. The Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper. A malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination. This issue affects mint: from 0.1.0 before 1.9.2.

Severity

6.3 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-14 12:25 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

EEF CNA under the mitre root

CNA scorecard A 97/100 over 354 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/elixir-mint/mint/security/advi…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-59246.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-59246	related
https://github.com/elixir-mint/mint/commit/5779de…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
elixir-mint	mint	Affected: 0.1.0 , < 1.9.2 (semver) cpe:2.3:a:elixir-mint:mint::::::::
elixir-mint	mint	Affected: 596ca4304504be68939c4929e0831557097962b8 , < 5779de1666344b32aefc4354184ea07f902f73ce (git) cpe:2.3:a:elixir-mint:mint::::::::

Credits

zx (Jace) Andrea Leopardi Eric Meadows-Jönsson Jonatan Männchen / EEF

Show details on NVD website

JSON

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            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
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            "metrics": [
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                "other": {
                  "content": {
                    "id": "CVE-2026-59246",
                    "options": [
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                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
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              "dateUpdated": "2026-07-14T12:24:16.265Z",
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            "title": "CISA ADP Vulnrichment"
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        ],
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              "cpes": [
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              ],
              "defaultStatus": "unaffected",
              "modules": [
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              "cpes": [
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              "modules": [
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          "cpeApplicability": [
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                  "negate": false,
                  "operator": "OR"
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              ],
              "operator": "AND"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "zx (Jace)"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Andrea Leopardi"
            },
            {
              "lang": "en",
              "type": "remediation reviewer",
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            },
            {
              "lang": "en",
              "type": "analyst",
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              "lang": "en",
              "supportingMedia": [
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                  "value": "\u003cp\u003eAllocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\u003c/p\u003e\u003cp\u003eThe \u003ctt\u003eMint.HTTP2.handle_continuation/3\u003c/tt\u003e function in \u003ctt\u003elib/mint/http2.ex\u003c/tt\u003e accumulates the header-block fragment carried by each HTTP/2 \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame into a growing \u003ctt\u003econn.headers_being_processed\u003c/tt\u003e nesting, one level deeper per frame, and only releases it when a frame with the \u003ctt\u003eEND_HEADERS\u003c/tt\u003e flag arrives. The only guard on this accumulator is \u003ctt\u003eMint.HTTP2.assert_header_block_within_max_size/2\u003c/tt\u003e, which sums the byte size of the fragments received so far. Because a \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames adds no bytes to the running total, never trips the size cap, and never emits \u003ctt\u003eEND_HEADERS\u003c/tt\u003e, yet each frame still nests the accumulator one level deeper.\u003c/p\u003e\u003cp\u003eA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a \u003ctt\u003eHEADERS\u003c/tt\u003e frame without \u003ctt\u003eEND_HEADERS\u003c/tt\u003e and then stream zero-length \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\u003c/p\u003e\u003cp\u003eThis issue affects mint: from 0.1.0 before 1.9.2.\u003c/p\u003e"
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              ],
              "value": "Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\n\nThe Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.\n\nA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\n\nThis issue affects mint: from 0.1.0 before 1.9.2."
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                "baseScore": 6.3,
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                "subIntegrityImpact": "NONE",
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          "problemTypes": [
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                  "type": "CWE"
                }
              ]
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          ],
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            "dateUpdated": "2026-07-14T15:08:39.463Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "related"
              ],
              "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-59246.html"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59246"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Zero-length HTTP/2 CONTINUATION frames bypass Mint\u0027s header-block byte-size cap and exhaust client memory",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-59246",
        "datePublished": "2026-07-14T08:37:04.609Z",
        "dateReserved": "2026-07-04T04:24:03.652Z",
        "dateUpdated": "2026-07-14T15:08:39.463Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
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}

FKIE_CVE-2026-59246

Vulnerability from fkie_nvd - Published: 2026-07-14 09:16 - Updated: 2026-10-24 21:10

Severity

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

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-59246.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-59246
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9

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:assert_header_block_within_max_size/2"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "1.9.2",
              "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:assert_header_block_within_max_size/2"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "5779de1666344b32aefc4354184ea07f902f73ce",
              "status": "affected",
              "version": "596ca4304504be68939c4929e0831557097962b8",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\n\nThe Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.\n\nA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\n\nThis issue affects mint: from 0.1.0 before 1.9.2."
    },
    {
      "lang": "es",
      "value": "La vulnerabilidad de asignaci\u00f3n de recursos sin l\u00edmites en elixir-mint mint permite a un servidor HTTP/2 remoto agotar la memoria en el host del cliente y causar una denegaci\u00f3n de servicio.\n\nLa funci\u00f3n Mint.HTTP2.handle_continuation/3 en lib/mint/http2.ex acumula el fragmento de bloque de encabezado transportado por cada trama CONTINUATION de HTTP/2 en un anidamiento creciente de conn.headers_being_processed, un nivel m\u00e1s profundo por trama, y solo lo libera cuando llega una trama con la bandera END_HEADERS. La \u00fanica protecci\u00f3n en este acumulador es Mint.HTTP2.assert_header_block_within_max_size/2, que suma el tama\u00f1o en bytes de los fragmentos recibidos hasta el momento. Debido a que una trama CONTINUATION est\u00e1 permitida por el protocolo para transportar una carga \u00fatil de longitud cero, una cadena ilimitada de tramas CONTINUATION de longitud cero no a\u00f1ade bytes al total acumulado, nunca supera el l\u00edmite de tama\u00f1o y nunca emite END_HEADERS, sin embargo, cada trama anida el acumulador un nivel m\u00e1s profundo.\n\nUn servidor HTTP/2 malicioso (accesible directamente, a trav\u00e9s de una redirecci\u00f3n controlada por un atacante, a trav\u00e9s de SSRF, o a trav\u00e9s de un man-in-the-middle) puede abrir un flujo enviando una trama HEADERS sin END_HEADERS y luego transmitir tramas CONTINUATION de longitud cero indefinidamente. La memoria del cliente crece una celda cons por cada trama recibida; el ancho de banda sostenido del par lleva al nodo BEAM que ejecuta el cliente Mint al agotamiento de la memoria y a una eventual terminaci\u00f3n por falta de memoria.\n\nEste problema afecta a mint: desde 0.1.0 antes de 1.9.2."
    }
  ],
  "id": "CVE-2026-59246",
  "lastModified": "2026-10-24T21:10:00.130",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "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:L/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": "LOW",
          "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-2026-59246",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-14T12:25:59.949476Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-14T09:16:41.727",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-59246.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59246"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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