{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "1.0.2"
              },
              {
                "fixed": "1.0.2zq"
              },
              {
                "introduced": "1.1.1"
              },
              {
                "fixed": "1.1.1zh"
              },
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.0.21"
              },
              {
                "introduced": "3.4.0"
              },
              {
                "fixed": "3.4.6"
              },
              {
                "introduced": "3.5.0"
              },
              {
                "fixed": "3.5.7"
              },
              {
                "introduced": "3.6.0"
              },
              {
                "fixed": "3.6.3"
              },
              {
                "introduced": "4.0.0-NA"
              },
              {
                "last_affected": "4.0.0-NA"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
            },
            {
              "fixed": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
            },
            {
              "introduced": "e04bd3433fd84e1861bf258ea37928d9845e6a86"
            },
            {
              "fixed": "e04bd3433fd84e1861bf258ea37928d9845e6a86"
            },
            {
              "introduced": "89cd17a031e022211684eb7eb41190cf1910f9fa"
            },
            {
              "fixed": "51ea949dc1436e865935b47874b21a3bb31a102e"
            },
            {
              "introduced": "98acb6b02839c609ef5b837794e08d906d965335"
            },
            {
              "fixed": "c5ea1cc227fd60afae8ac4b9438690bbe4888f79"
            },
            {
              "introduced": "636dfadc70ce26f2473870570bfd9ec352806b1d"
            },
            {
              "fixed": "8cf17aaeb4599f8af87fefd810b5b5fee90fe69e"
            },
            {
              "introduced": "7b371d80d959ec9ab4139d09d78e83c090de9779"
            },
            {
              "fixed": "aae016bfd52fcad2bc9657c2c782cfdf73b1ed5f"
            },
            {
              "introduced": "11b7b6ea3b65a584e1d31408ed1bdb139465cffd"
            },
            {
              "fixed": "05b066366842f930fadd9a6e94df98030af431bb"
            },
            {
              "fixed": "3d8d5bc1056b2f62da9fede23fedbf47e85187b0"
            },
            {
              "fixed": "715349a1d7c6db970e6815dafb90915f07307f98"
            },
            {
              "fixed": "77bf00ab13f6ff5e516535432f0328ed70ec0c26"
            },
            {
              "fixed": "eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"
            }
          ],
          "repo": "https://github.com/openssl/openssl",
          "type": "GIT"
        }
      ],
      "versions": [
        "4.0.0-NA"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "openssl",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9076.json"
  },
  "details": "Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap)\nprocesses attacker-supplied CMS data, an attacker-chosen stream-mode KEK\ncipher can trigger a heap out-of-bounds read in kek_unwrap_key().\n\nImpact summary: A heap buffer over-read may trigger a crash which leads to\nDenial of Service for an application if the input buffer ends at a memory\npage boundary and the following page is unmapped. There is no information\ndisclosure as the over-read bytes are not revealed to the attacker.\n\nThe key unwrapping function performs a check-byte test as specified in the\nRFC that reads 7 bytes from a heap allocation that is based on the wrapped\nkey length from the message. There is a minimum length check based on the\nblock length of the wrapping cipher. However the cipher is selected from\nan OID carried in the attacker's PWRI keyEncryptionAlgorithm with no\nrequirement that the cipher be a block cipher. When an attacker selects\na stream-mode cipher the guard will be ineffective and the allocated buffer\ncontaining the unwrapped key can be too small to fit the check-bytes\nspecified in the RFC and a buffer over-read can happen.\n\nApplications calling CMS_decrypt() or CMS_decrypt_set1_password()\n(equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS\ndata are vulnerable to this issue. No password knowledge is required: the\nover-read happens during the unwrap attempt before any authentication\nsucceeds.\n\nThe over-read is limited to a few bytes and is not written to output, so\nthere is no information disclosure. Triggering a crash requires the\nallocation to border unmapped memory, which is unlikely with the normal\nallocator.\n\nThe FIPS modules are not affected by this issue.",
  "id": "CVE-2026-9076",
  "modified": "2026-07-25T03:56:32.909077357Z",
  "published": "2026-06-09T16:03:16.306Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9076.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9076"
    },
    {
      "type": "ADVISORY",
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/05b066366842f930fadd9a6e94df98030af431bb"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/3d8d5bc1056b2f62da9fede23fedbf47e85187b0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/715349a1d7c6db970e6815dafb90915f07307f98"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/77bf00ab13f6ff5e516535432f0328ed70ec0c26"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Out-of-Bounds Read in CMS Password-Based Decryption"
}