{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 9.1,
              "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:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-34182",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T15:58:17.905043Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-10T15:58:52.695Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Asim Viladi Oglu Manizada"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Alex Gaynor (Anthropic)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Ying Dong"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Haiyang Huang"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Neil Horman"
        }
      ],
      "datePublic": "2026-06-09T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Issue Summary: Cryptographic Message Services (CMS) processing fails to perform\u003cbr\u003esufficient input validation on the cipher and tag length fields of\u003cbr\u003eAuthEnvelopedData containers, leading to various potential compromises.\u003cbr\u003e\u003cbr\u003eImpact Summary: Attackers making use of these vulnerabilities may achieve\u003cbr\u003ekey-equivalent functionality for a given CMS recipient and/or bypass integrity\u003cbr\u003evalidation for a given message.\u003cbr\u003e\u003cbr\u003eIn one use case, an attacker may send a CMS message containing\u003cbr\u003eAuthEnvelopedData with the cipher specified as a non-AEAD cipher.  OpenSSL\u003cbr\u003eerroneously allows this selection, and attempts to decrypt and validate the\u003cbr\u003emessage.\u003cbr\u003e\u003cbr\u003eAn on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData\u003cbr\u003eaddressed to the victim can re-emit it with the recipientInfos set left\u003cbr\u003ebyte-for-byte intact, so the victim\u0027s private key still unwraps the genuine CEK\u003cbr\u003e(the content-encryption key), but with the inner OID rewritten to AES-256-OFB\u003cbr\u003e(Output Feedback Mode, an unauthenticated keystream mode) and with an\u003cbr\u003eattacker-chosen IV and ciphertext. The victim initializes AES-256-OFB under the\u003cbr\u003ereal CEK, never consults the MAC field, and CMS_decrypt() returns success.\u003cbr\u003e\u003cbr\u003eIf the application under attack responds to the attacker with any indicator\u003cbr\u003eshowing success or failure of the decryption effort, it is possible for the\u003cbr\u003eattacker to use this as an oracle to obtain key equivalent functionality for the\u003cbr\u003eCEK used for the chosen recipient of the message.\u003cbr\u003e\u003cbr\u003eIn another use case, an attacker can reduce the tag length of the chosen AEAD\u003cbr\u003ecipher for a given AuthEnvelopedData container to be a single byte long,\u003cbr\u003eallowing an attacker to brute force CMS decryption, producing an integrity\u003cbr\u003ebypass for applications that trust CMS_decrypt() to reject modified content.\u003cbr\u003e\u003cbr\u003eThe FIPS modules are not affected by this issue."
            }
          ],
          "value": "Issue Summary: Cryptographic Message Services (CMS) processing fails to perform\nsufficient input validation on the cipher and tag length fields of\nAuthEnvelopedData containers, leading to various potential compromises.\n\nImpact Summary: Attackers making use of these vulnerabilities may achieve\nkey-equivalent functionality for a given CMS recipient and/or bypass integrity\nvalidation for a given message.\n\nIn one use case, an attacker may send a CMS message containing\nAuthEnvelopedData with the cipher specified as a non-AEAD cipher.  OpenSSL\nerroneously allows this selection, and attempts to decrypt and validate the\nmessage.\n\nAn on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData\naddressed to the victim can re-emit it with the recipientInfos set left\nbyte-for-byte intact, so the victim\u0027s private key still unwraps the genuine CEK\n(the content-encryption key), but with the inner OID rewritten to AES-256-OFB\n(Output Feedback Mode, an unauthenticated keystream mode) and with an\nattacker-chosen IV and ciphertext. The victim initializes AES-256-OFB under the\nreal CEK, never consults the MAC field, and CMS_decrypt() returns success.\n\nIf the application under attack responds to the attacker with any indicator\nshowing success or failure of the decryption effort, it is possible for the\nattacker to use this as an oracle to obtain key equivalent functionality for the\nCEK used for the chosen recipient of the message.\n\nIn another use case, an attacker can reduce the tag length of the chosen AEAD\ncipher for a given AuthEnvelopedData container to be a single byte long,\nallowing an attacker to brute force CMS decryption, producing an integrity\nbypass for applications that trust CMS_decrypt() to reject modified content.\n\nThe FIPS modules are not affected by this issue."
        }
      ],
      "metrics": [
        {
          "format": "other",
          "other": {
            "content": {
              "text": "Moderate"
            },
            "type": "https://openssl-library.org/policies/general/security-policy/"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-354",
              "description": "CWE-354 Improper Validation of Integrity Check Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-10T07:47:54.994Z",
        "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "shortName": "openssl"
      },
      "references": [
        {
          "name": "OpenSSL Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://openssl-library.org/news/secadv/20260609.txt"
        },
        {
          "name": "4.0.1 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/9fd97f8cfdc2c0be214998de3b2b55c8edf6c7ac"
        },
        {
          "name": "3.6.3 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/439ed7d2c0962ce964482727264668bf277c333f"
        },
        {
          "name": "3.5.7 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/7947e6a81eb8776802f159fb6762cb7fcf7e34c7"
        },
        {
          "name": "3.4.6 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/d2ca86bcd43e4f17d899f347101766b6107676e0"
        },
        {
          "name": "3.0.21 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/03c1f4d45fb963aee7d5833390c507cd290182bc"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CMS AuthEnvelopedData Processing May Accept Forged Messages",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2026-34182",
    "datePublished": "2026-06-09T16:03:22.848Z",
    "dateReserved": "2026-03-26T09:29:36.013Z",
    "dateUpdated": "2026-06-10T15:58:52.695Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}