{"id":"JLSEC-2026-1156","summary":"Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap) processes attacker...","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.","modified":"2026-08-03T19:20:53.407349718Z","published":"2026-08-03T19:08:57.739Z","upstream":["CVE-2026-9076","EUVD-2026-35475","GHSA-q98x-73c3-57gj"],"database_specific":{"license":"CC-BY-4.0","sources":[{"url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-9076","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9076","database_specific":{"status":"Analyzed"},"id":"CVE-2026-9076","imported":"2026-08-03T18:18:16.092Z","modified":"2026-07-23T08:10:00.137Z","published":"2026-06-09T17:17:50.997Z"},{"imported":"2026-08-03T18:18:49.541Z","modified":"2026-06-10T09:32:59Z","published":"2026-06-09T18:31:01Z","url":"https://api.github.com/advisories/GHSA-q98x-73c3-57gj","html_url":"https://github.com/advisories/GHSA-q98x-73c3-57gj","id":"GHSA-q98x-73c3-57gj"},{"url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-35475","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-35475","id":"EUVD-2026-35475","imported":"2026-08-03T18:18:18.303Z","modified":"2026-06-10T07:47:51Z","published":"2026-06-09T16:03:16Z"}]},"references":[{"type":"WEB","url":"https://github.com/advisories/GHSA-q98x-73c3-57gj"},{"type":"WEB","url":"https://github.com/openssl/openssl/commit/05b066366842f930fadd9a6e94df98030af431bb"},{"type":"WEB","url":"https://github.com/openssl/openssl/commit/3d8d5bc1056b2f62da9fede23fedbf47e85187b0"},{"type":"WEB","url":"https://github.com/openssl/openssl/commit/715349a1d7c6db970e6815dafb90915f07307f98"},{"type":"WEB","url":"https://github.com/openssl/openssl/commit/77bf00ab13f6ff5e516535432f0328ed70ec0c26"},{"type":"WEB","url":"https://github.com/openssl/openssl/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"},{"type":"WEB","url":"https://github.com/openssl/security/commit/05b066366842f930fadd9a6e94df98030af431bb"},{"type":"WEB","url":"https://github.com/openssl/security/commit/3d8d5bc1056b2f62da9fede23fedbf47e85187b0"},{"type":"WEB","url":"https://github.com/openssl/security/commit/715349a1d7c6db970e6815dafb90915f07307f98"},{"type":"WEB","url":"https://github.com/openssl/security/commit/77bf00ab13f6ff5e516535432f0328ed70ec0c26"},{"type":"WEB","url":"https://github.com/openssl/security/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9076"},{"type":"WEB","url":"https://openssl-library.org/news/secadv/20260609.txt"}],"affected":[{"package":{"name":"AppBundler","ecosystem":"Julia","purl":"pkg:julia/AppBundler?uuid=40eb83ae-c93a-480c-8f39-f018b568f472"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.0.0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1156.json"}},{"package":{"name":"OpenSSL_jll","ecosystem":"Julia","purl":"pkg:julia/OpenSSL_jll?uuid=458c3c95-2e84-50aa-8efc-19380b2a3a95"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.5.7+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1156.json"}},{"package":{"name":"Openresty_jll","ecosystem":"Julia","purl":"pkg:julia/Openresty_jll?uuid=87da34d4-7b1b-5a94-8376-8cb65bf3132c"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1156.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}