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CVE-2026-43972

Estado: AnalizadaMedia (6.3)—

Origin Validation Error vulnerability in ninenines gun (gun_http2 module) allows cross-origin cookie injection via unvalidated HTTP/2 PUSH_PROMISE authority.

In gun_http2:push_promise_frame/7, the :authority pseudo-header from an incoming PUSH_PROMISE frame is stored verbatim into the promised stream record without checking that it matches the connection's origin. When gun_http2:headers_frame/9 later processes the response headers for the promised stream, it calls gun_cookies:set_cookie_header/7 with the unvalidated server-supplied authority before any status branching and before user code can act. This violates RFC 7540 §10.6 / RFC 9113 §8.4, which require receivers to treat as a protocol error any push for a resource the server is not authoritative for.

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A malicious or compromised HTTP/2 server can plant cookies scoped to arbitrary third-party domains into the client's shared cookie store. This enables session fixation attacks against those domains and, if the planted cookie overrides a legitimate session token, may result in account takeover. No user interaction beyond making a normal HTTP/2 request to the attacker-controlled server is required.

This issue affects gun: from 2.0.0 before 2.4.0.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Ninenines — GUN

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-43972",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-43972",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-08T15:42:59.352280Z"
        }
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    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 3.9
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    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.3,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/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",
          "exploitMaturity": "NOT_DEFINED",
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          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "LOW",
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          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
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          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "affected": [
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      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/ninenines/gun",
          "vendor": "ninenines",
          "modules": [
            "gun_http2"
          ],
          "product": "gun",
          "versions": [
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              "version": "2.0.0",
              "lessThan": "2.4.0",
              "versionType": "semver"
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          ],
          "packageURL": "pkg:hex/gun",
          "packageName": "gun",
          "programFiles": [
            "src/gun_http2.erl"
          ],
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "gun_http2:push_promise_frame/7"
            },
            {
              "name": "gun_http2:headers_frame/9"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/ninenines/gun.git",
          "vendor": "ninenines",
          "modules": [
            "gun_http2"
          ],
          "product": "gun",
          "versions": [
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              "version": "871989eef53663285c165fdfb83a5918ebe00d41",
              "lessThan": "567863ff53802fed21c3b3f25812db7f7ae29676",
              "versionType": "git"
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          ],
          "packageURL": "pkg:github/ninenines/gun",
          "packageName": "ninenines/gun",
          "programFiles": [
            "src/gun_http2.erl"
          ],
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "gun_http2:push_promise_frame/7"
            },
            {
              "name": "gun_http2:headers_frame/9"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-08T15:16:46.290",
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-43972.html",
      "tags": [
        "Third Party Advisory",
        "Patch"
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ninenines/gun/commit/567863ff53802fed21c3b3f25812db7f7ae29676",
      "tags": [
        "Patch"
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-43972",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
        {
          "lang": "en",
          "value": "CWE-346"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Origin Validation Error vulnerability in ninenines gun (gun_http2 module) allows cross-origin cookie injection via unvalidated HTTP/2 PUSH_PROMISE authority.\n\nIn gun_http2:push_promise_frame/7, the :authority pseudo-header from an incoming PUSH_PROMISE frame is stored verbatim into the promised stream record without checking that it matches the connection's origin. When gun_http2:headers_frame/9 later processes the response headers for the promised stream, it calls gun_cookies:set_cookie_header/7 with the unvalidated server-supplied authority before any status branching and before user code can act. This violates RFC 7540 §10.6 / RFC 9113 §8.4, which require receivers to treat as a protocol error any push for a resource the server is not authoritative for.\n\nA malicious or compromised HTTP/2 server can plant cookies scoped to arbitrary third-party domains into the client's shared cookie store. This enables session fixation attacks against those domains and, if the planted cookie overrides a legitimate session token, may result in account takeover. No user interaction beyond making a normal HTTP/2 request to the attacker-controlled server is required.\n\nThis issue affects gun: from 2.0.0 before 2.4.0."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de error de validación de origen en ninenines gun (módulo gun_http2) permite la inyección de cookies de origen cruzado a través de la autoridad PUSH_PROMISE de HTTP/2 no validada.\n\nEn gun_http2:push_promise_frame/7, el pseudo-encabezado :authority de un frame PUSH_PROMISE entrante se almacena textualmente en el registro del stream prometido sin verificar que coincida con el origen de la conexión. Cuando gun_http2:headers_frame/9 procesa posteriormente los encabezados de respuesta para el stream prometido, llama a gun_cookies:set_cookie_header/7 con la autoridad proporcionada por el servidor no validada antes de cualquier ramificación de estado y antes de que el código de usuario pueda actuar. Esto viola RFC 7540 §10.6 / RFC 9113 §8.4, que requieren que los receptores traten como un error de protocolo cualquier push para un recurso para el que el servidor no es autoritativo.\n\nUn servidor HTTP/2 malicioso o comprometido puede insertar cookies con alcance a dominios de terceros arbitrarios en el almacén de cookies compartido del cliente. Esto permite ataques de fijación de sesión contra esos dominios y, si la cookie insertada anula un token de sesión legítimo, puede resultar en la toma de control de la cuenta. No se requiere interacción del usuario más allá de realizar una solicitud HTTP/2 normal al servidor controlado por el atacante.\n\nEste problema afecta a gun: desde 2.0.0 antes de 2.4.0."
    }
  ],
  "lastModified": "2026-08-18T15:42:54.483",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "749B0FB5-7AC7-4FAB-A461-90450AA8AC67",
              "versionEndExcluding": "2.4.0",
              "versionStartIncluding": "2.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}