{"id":"CVE-2026-75805","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 \u003cfile\u003e' 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.","modified":"2026-10-01T08:09:04.389840Z","published":"2026-09-29T15:32:20.408Z","database_specific":{"cna_assigner":"openssl","cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75805.json","unresolved_ranges":[{"extracted_events":[{"introduced":"3.0.0"},{"fixed":"3.0.23"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75805.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75805"},{"type":"ADVISORY","url":"https://openssl-library.org/news/secadv/20260929.txt"},{"type":"FIX","url":"https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"},{"type":"FIX","url":"https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"},{"type":"FIX","url":"https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"},{"type":"FIX","url":"https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openssl/openssl","events":[{"introduced":"11b7b6ea3b65a584e1d31408ed1bdb139465cffd"},{"introduced":"7b371d80d959ec9ab4139d09d78e83c090de9779"},{"introduced":"636dfadc70ce26f2473870570bfd9ec352806b1d"},{"introduced":"98acb6b02839c609ef5b837794e08d906d965335"},{"fixed":"af1775b60dfa141a4ad762585052cabeb9f37e9e"},{"fixed":"c8bd5a57108599ac650bbae77fcabe3109dab2e8"},{"fixed":"45e844fa2a14ec92d146bd8f5778ac130b6625fb"},{"fixed":"e72c946f6f6d94c8ba5119acb25340b7b6b2073f"},{"fixed":"7588db7fef14209c3caa3a101d11a02006b19166"},{"fixed":"7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"},{"fixed":"9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"},{"fixed":"abf02872a4b71767ecc72293424420f5b009190f"}],"database_specific":{"extracted_events":[{"introduced":"4.0.0"},{"fixed":"4.0.3"},{"introduced":"3.6.0"},{"fixed":"3.6.5"},{"introduced":"3.5.0"},{"fixed":"3.5.9"},{"introduced":"3.4.0"},{"fixed":"3.4.8"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["openssl-3.4.7","openssl-3.5.8","openssl-3.6.4","openssl-4.0.2","openssl-3.4.6","openssl-3.5.7","openssl-3.6.3","openssl-4.0.1","openssl-4.0.0","openssl-3.4.5","openssl-3.5.6","openssl-3.6.2","openssl-3.4.4","openssl-3.5.5","openssl-3.6.1","3.4-POST-CLANG-FORMAT-WEBKIT","3.4-PRE-CLANG-FORMAT-WEBKIT","3.5-POST-CLANG-FORMAT-WEBKIT","3.5-PRE-CLANG-FORMAT-WEBKIT","3.6-POST-CLANG-FORMAT-WEBKIT","3.6-PRE-CLANG-FORMAT-WEBKIT","openssl-3.6.0","openssl-3.4.3","openssl-3.5.4","openssl-3.5.3","openssl-3.5.2","openssl-3.4.2","openssl-3.5.1","openssl-3.5.0","openssl-3.4.1","openssl-3.4.0"],"database_specific":{"vanir_signatures_modified":"2026-10-01T08:09:04Z","vanir_signatures":[{"signature_version":"v1","source":"https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7","target":{"file":"crypto/cmp/cmp_client.c"},"deprecated":false,"digest":{"line_hashes":["43075780838413988413269048218040878757","286110984278643356257291401350875321692","294726310215084298772172767016676020898","261504606235808187659561767796648720247","253634754479682079335134715767389161231","156915954067464833068464363992585529346","102394916624387975450542883355396953297","315079978878856206236194114108122839957","185726040668792320533229609529659198452","278927895160880272467594550859138766983","261529115231075743537237536881002074254","307904670408872123303432773691756649827","133747528749621462998913534417823436595"],"threshold":0.9},"id":"CVE-2026-75805-0237df62","signature_type":"Line"},{"id":"CVE-2026-75805-0e6b9381","signature_type":"Line","signature_version":"v1","source":"https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f","target":{"file":"crypto/cmp/cmp_client.c"},"deprecated":false,"digest":{"line_hashes":["43075780838413988413269048218040878757","286110984278643356257291401350875321692","294726310215084298772172767016676020898","261504606235808187659561767796648720247","253634754479682079335134715767389161231","156915954067464833068464363992585529346","102394916624387975450542883355396953297","315079978878856206236194114108122839957","185726040668792320533229609529659198452","278927895160880272467594550859138766983","261529115231075743537237536881002074254","307904670408872123303432773691756649827","133747528749621462998913534417823436595"],"threshold":0.9}},{"digest":{"function_hash":"199313772157142886480371169309621518878","length":3126},"id":"CVE-2026-75805-18500d98","signature_type":"Function","signature_version":"v1","source":"https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3","target":{"file":"crypto/cmp/cmp_client.c","function":"OSSL_CMP_exec_RR_ses"},"deprecated":false},{"source":"https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166","target":{"file":"crypto/cmp/cmp_client.c"},"deprecated":false,"digest":{"line_hashes":["430757808384139884132690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