{"schema":"threatline.record/2","record":{"id":"CVE-2026-75805","aliases":[],"summary":"NULL Pointer Dereference in CMP Client Revocation Response Handling","details":"Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n'openssl cmp -cmd rr -csr <file>' on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary.","categories":["Libraries & packages"],"product":"OpenSSL","vendor":"OpenSSL","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","source_modified_at":"2026-09-29T16:54:39.263Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"OpenSSL","vendor":"OpenSSL","versions":[{"lessThan":"4.0.3","status":"affected","version":"4.0.0","versionType":"semver"},{"lessThan":"3.6.5","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.9","status":"affected","version":"3.5.0","versionType":"semver"},{"lessThan":"3.4.8","status":"affected","version":"3.4.0","versionType":"semver"},{"lessThan":"3.0.23","status":"affected","version":"3.0.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","source_modified_at":"2026-09-29T16:54:39.263Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"OpenSSL","ecosystem":null},"version":"4.0.3","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","source_modified_at":"2026-09-29T16:54:39.263Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"OpenSSL","ecosystem":null},"version":"3.6.5","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","source_modified_at":"2026-09-29T16:54:39.263Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"OpenSSL","ecosystem":null},"version":"3.5.9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","source_modified_at":"2026-09-29T16:54:39.263Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"OpenSSL","ecosystem":null},"version":"3.4.8","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","source_modified_at":"2026-09-29T16:54:39.263Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"OpenSSL","ecosystem":null},"version":"3.0.23","basis":"first unaffected version stated in the CVE record"}],"cvss":5.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00222,"percentile":0.12084,"score_date":"2026-10-23"},"published_at":"2026-09-29T15:32:20.408Z","modified_at":"2026-09-29T16:54:39.263Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-29T16:54:39.263Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-75805","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://openssl-library.org/news/secadv/20260929.txt","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7","tags":["patch"]},{"source":"CVE List","url":"https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166","tags":["patch"]},{"source":"CVE List","url":"https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3","tags":["patch"]},{"source":"CVE List","url":"https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f","tags":["patch"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-09-29T16:54:03.315064Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-29T16:54:39.263Z","content_hash":"3652a8c95b7a394fb4f8abbd665c0e4ce1a423d8d78616a4e1151a1a82b20007"}}