FKIE_CVE-2026-23941

Vulnerability from fkie_nvd - Published: 2026-03-13 19:54 - Updated: 2026-07-24 15:17
Severity
9.4 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Summary
Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in Erlang OTP (inets httpd module) allows HTTP Request Smuggling. This vulnerability is associated with program files lib/inets/src/http_server/httpd_request.erl and program routines httpd_request:parse_headers/7. The server does not reject or normalize duplicate Content-Length headers. The earliest Content-Length in the request is used for body parsing while common reverse proxies (nginx, Apache httpd, Envoy) honor the last Content-Length value. This violates RFC 9112 Section 6.3 and allows front-end/back-end desynchronization, leaving attacker-controlled bytes queued as the start of the next request. This issue affects OTP from OTP 17.0 before OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to inets from 5.10 before 9.6.1, 9.3.2.3 and 9.1.0.5.
References
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://cna.erlef.org/cves/CVE-2026-23941.htmlVendor Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45bPatch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7Vendor Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://osv.dev/vulnerability/EEF-CVE-2026-23941Third Party Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://www.erlang.org/doc/system/versions.html#order-of-versionsProduct
Impacted products
Vendor Product Version
erlang erlang\/inets *
erlang erlang\/inets *
erlang erlang\/inets *
erlang erlang\/otp *
erlang erlang\/otp *
erlang erlang\/otp *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "modules": [
            "httpd_request"
          ],
          "packageName": "inets",
          "packageURL": "pkg:otp/inets?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
          "product": "OTP",
          "programFiles": [
            "src/http_server/httpd_request.erl"
          ],
          "programRoutines": [
            {
              "name": "httpd_request:parse_headers/7"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
                {
                  "at": "9.6.1",
                  "status": "unaffected"
                },
                {
                  "at": "9.3.2.3",
                  "status": "unaffected"
                },
                {
                  "at": "9.1.0.5",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "5.10",
              "versionType": "otp"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "modules": [
            "httpd_request"
          ],
          "packageName": "erlang/otp",
          "packageURL": "pkg:github/erlang/otp",
          "product": "OTP",
          "programFiles": [
            "lib/inets/src/http_server/httpd_request.erl"
          ],
          "programRoutines": [
            {
              "name": "httpd_request:parse_headers/7"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
                {
                  "at": "28.4.1",
                  "status": "unaffected"
                },
                {
                  "at": "27.3.4.9",
                  "status": "unaffected"
                },
                {
                  "at": "26.2.5.18",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "17.0",
              "versionType": "otp"
            },
            {
              "changes": [
                {
                  "at": "a4b46336fd25aa100ac602eb9a627aaead7eda18",
                  "status": "unaffected"
                },
                {
                  "at": "a761d391d8d08316cbd7d4a86733ba932b73c45b",
                  "status": "unaffected"
                },
                {
                  "at": "e775a332f623851385ab6ddb866d9b150612ddf6",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "84adefa331c4159d432d22840663c38f155cd4c1",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/inets:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "51F23E56-D6A0-4406-BF11-862502FAFE38",
              "versionEndExcluding": "9.1.0.5",
              "versionStartIncluding": "5.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/inets:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "61E04989-9259-49AF-866D-98385A3A1EA0",
              "versionEndExcluding": "9.3.2.3",
              "versionStartIncluding": "9.3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/inets:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D2EA5EC1-0077-459E-A77C-A5CE93AF737D",
              "versionEndExcluding": "9.6.1",
              "versionStartIncluding": "9.6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6241E245-67D2-4FA6-83FE-4E9A4A07B3D1",
              "versionEndExcluding": "26.2.5.18",
              "versionStartIncluding": "17.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BE60BA92-431E-4DE3-A1C1-E8976E3A6BA7",
              "versionEndExcluding": "27.3.4.9",
              "versionStartIncluding": "27.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B8D9E80B-CA20-423A-A1A8-DEBB99D82BDB",
              "versionEndExcluding": "28.4.1",
              "versionStartIncluding": "28.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request Smuggling\u0027) vulnerability in Erlang OTP (inets httpd module) allows HTTP Request Smuggling.\n\nThis vulnerability is associated with program files lib/inets/src/http_server/httpd_request.erl and program routines httpd_request:parse_headers/7.\n\nThe server does not reject or normalize duplicate Content-Length headers. The earliest Content-Length in the request is used for body parsing while common reverse proxies (nginx, Apache httpd, Envoy) honor the last Content-Length value. This violates RFC 9112 Section 6.3 and allows front-end/back-end desynchronization, leaving attacker-controlled bytes queued as the start of the next request.\n\nThis issue affects OTP from OTP 17.0 before OTP\u00a028.4.1, OTP\u00a027.3.4.9 and OTP\u00a026.2.5.18, corresponding to inets from 5.10 before 9.6.1, 9.3.2.3 and 9.1.0.5."
    },
    {
      "lang": "es",
      "value": "La vulnerabilidad de Interpretaci\u00f3n inconsistente de solicitudes HTTP (\u0027Contrabando de solicitudes HTTP\u0027) en Erlang OTP (m\u00f3dulo inets httpd) permite el contrabando de solicitudes HTTP.\n\nEsta vulnerabilidad est\u00e1 asociada con los archivos de programa lib/inets/src/http_server/httpd_request.erl y las rutinas de programa httpd_request:parse_headers/7.\n\nEl servidor no rechaza ni normaliza los encabezados Content-Length duplicados. El Content-Length m\u00e1s temprano en la solicitud se utiliza para el an\u00e1lisis del cuerpo, mientras que los proxies inversos comunes (nginx, Apache httpd, Envoy) respetan el \u00faltimo valor de Content-Length. Esto viola la Secci\u00f3n 6.3 de RFC 9112 y permite la desincronizaci\u00f3n front-end/back-end, dejando bytes controlados por el atacante en cola como el inicio de la siguiente solicitud.\n\nEste problema afecta a OTP desde OTP 17.0 hasta OTP 28.4.1, OTP 27.3.4.9 y OTP 26.2.5.18, lo que corresponde a inets desde 5.10 hasta 9.6.1, 9.3.2.3 y 9.1.0.5."
    }
  ],
  "id": "CVE-2026-23941",
  "lastModified": "2026-07-24T15:17:14.157",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 9.4,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.0,
          "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": "LOW",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:L/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": "NONE",
          "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-2026-23941",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-13T16:00:50.466386Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-13T19:54:15.237",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://cna.erlef.org/cves/CVE-2026-23941.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-23941"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Product"
      ],
      "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    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.