FKIE_CVE-2026-34180

Vulnerability from fkie_nvd - Published: 2026-06-09 17:17 - Updated: 2026-07-23 08:10
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms. Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1 elements would instead be truncated. An integer truncation in OpenSSL's ASN.1 decoder causes the content length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly causing OpenSSL to read either less than or beyond the end of the allocated buffer. Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected. OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
References
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/1c6908e4fa5fa568752221d8eaf561a809751e5dPatch
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/cbe418ae978539cf14a398a207dba834c0e93e83Patch
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/d93853c42110d6319e3df07842b488cb9f7ac5ffPatch
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43Patch
openssl-security@openssl.orghttps://github.com/openssl/openssl/commit/f696c73c3e61b8c502d040af62e690c060908a16Patch
openssl-security@openssl.orghttps://openssl-library.org/news/secadv/20260609.txtVendor Advisory
Impacted products
Vendor Product Version
openssl openssl *
openssl openssl *
openssl openssl *
openssl openssl *
openssl openssl *
openssl openssl *
openssl openssl 4.0.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenSSL",
          "vendor": "OpenSSL",
          "versions": [
            {
              "lessThan": "4.0.1",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.6.3",
              "status": "affected",
              "version": "3.6.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.5.7",
              "status": "affected",
              "version": "3.5.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.4.6",
              "status": "affected",
              "version": "3.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.0.21",
              "status": "affected",
              "version": "3.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.1.1zh",
              "status": "affected",
              "version": "1.1.1",
              "versionType": "custom"
            },
            {
              "lessThan": "1.0.2zq",
              "status": "affected",
              "version": "1.0.2",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "openssl-security@openssl.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F534B804-67B6-49DA-8A86-0FF21E512908",
              "versionEndExcluding": "1.0.2zq",
              "versionStartIncluding": "1.0.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "43EFE1E3-4049-4EE6-A2AE-BDBA38E6870F",
              "versionEndExcluding": "1.1.1zh",
              "versionStartIncluding": "1.1.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "EDB88756-EDFE-4886-A267-3F19342A6042",
              "versionEndExcluding": "3.0.21",
              "versionStartIncluding": "3.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BF7E21E7-AEC0-4882-B1F1-2D056B506F22",
              "versionEndExcluding": "3.4.6",
              "versionStartIncluding": "3.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6B6B9930-C549-4D88-9784-AF32CCDDB87A",
              "versionEndExcluding": "3.5.7",
              "versionStartIncluding": "3.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D41B3C45-EC73-4DC8-989D-B2E2792E102F",
              "versionEndExcluding": "3.6.3",
              "versionStartIncluding": "3.6.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "6E881B9A-1A0A-4BC0-8160-20C00561167D",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive\nelement whose content exceeds 2 gigabytes in length may cause a heap buffer\nover-read on 64-bit Unix and Unix-like platforms.\n\nImpact summary: The heap buffer over-read may crash the application (Denial of\nService) or to load into the decoded ASN.1 object contents of memory beyond the\nend of the input buffer.  More typically such ASN.1 elements would instead be\ntruncated.\n\nAn integer truncation in OpenSSL\u0027s ASN.1 decoder causes the content length of\nan ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the\nworst case the truncated length is treated as a request to scan the binary\ncontent for a terminating zero byte, possibly causing OpenSSL to read either\nless than or beyond the end of the allocated buffer.\n\nApplications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or\nany other d2i_* decoding function are affected. OpenSSL\u0027s own command-line\ntools are not vulnerable, as data read through the BIO layer is checked before\nit reaches the affected code. The issue only affects 64-bit Unix and Unix-like\nplatforms; 32-bit platforms and 64-bit Windows are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,\nas the affected code is outside the OpenSSL FIPS module boundary."
    },
    {
      "lang": "es",
      "value": "Resumen del problema: Analizar una estructura ASN.1 codificada en DER manipulada con un elemento primitivo cuyo contenido excede los 2 gigabytes de longitud puede causar una lectura excesiva del b\u00fafer de la pila (heap buffer over-read) en plataformas Unix y similares a Unix de 64 bits.\n\nResumen del impacto: La lectura excesiva del b\u00fafer de la pila puede bloquear la aplicaci\u00f3n (Denegaci\u00f3n de Servicio) o cargar en el objeto ASN.1 decodificado contenidos de memoria m\u00e1s all\u00e1 del final del b\u00fafer de entrada. M\u00e1s t\u00edpicamente, tales elementos ASN.1 ser\u00edan truncados en su lugar.\n\nUn truncamiento de entero en el decodificador ASN.1 de OpenSSL hace que la longitud del contenido de un elemento primitivo ASN.1 sea manejada incorrectamente cuando excede los 2 gigabytes. En el peor de los casos, la longitud truncada se trata como una solicitud para escanear el contenido binario en busca de un byte cero de terminaci\u00f3n, posiblemente causando que OpenSSL lea menos o m\u00e1s all\u00e1 del final del b\u00fafer asignado.\n\nLas aplicaciones que pasan datos suministrados por el atacante a d2i_X509(), d2i_PKCS7(), o cualquier otra funci\u00f3n de decodificaci\u00f3n d2i_* se ven afectadas. Las propias herramientas de l\u00ednea de comandos de OpenSSL no son vulnerables, ya que los datos le\u00eddos a trav\u00e9s de la capa BIO se verifican antes de que lleguen al c\u00f3digo afectado. El problema solo afecta a plataformas Unix y similares a Unix de 64 bits; las plataformas de 32 bits y Windows de 64 bits no se ven afectadas.\n\nLos m\u00f3dulos FIPS en 4.0, 3.6, 3.5, 3.4 y 3.0 no se ven afectados por este problema, ya que el c\u00f3digo afectado est\u00e1 fuera del l\u00edmite del m\u00f3dulo FIPS de OpenSSL."
    }
  ],
  "id": "CVE-2026-34180",
  "lastModified": "2026-07-23T08:10:00.137",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34180",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-09T19:00:59.503895Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-09T17:17:04.600",
  "references": [
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/1c6908e4fa5fa568752221d8eaf561a809751e5d"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/cbe418ae978539cf14a398a207dba834c0e93e83"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/d93853c42110d6319e3df07842b488cb9f7ac5ff"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/da5d62af75f69d6fbf7803743d7c56ac75461e43"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/f696c73c3e61b8c502d040af62e690c060908a16"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    }
  ],
  "sourceIdentifier": "openssl-security@openssl.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "openssl-security@openssl.org",
      "type": "Secondary"
    }
  ]
}



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