{"schema_version":"1","data":[{"id":3848,"advisory_id":"f7cdf6d4-ea80-4ad2-b6f2-b84f1dcc85b7","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-75805","source_published_at":"2026-09-29T15:32:20.408+00:00","published_at":"2026-10-24T21:42:24.43877+00:00","extraction_method":"structured","technologies":["core-cve","openssl"],"cve_ids":["CVE-2026-75805"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"NULL Pointer Dereference in CMP Client Revocation Response Handling","summary":"Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr ' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a ","evidence":"cve:CVE-2026-75805","products":[{"name":{"value":"OpenSSL","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"unknown","structured":{"id":"CVE-2026-75805","aliases":["CVE-2026-75805"],"metrics":[{"other":{"type":"https://openssl-library.org/policies/general/security-policy/","content":{"text":"Low"}},"format":"other"}],"affected":[{"vendor":"OpenSSL","product":"OpenSSL","versions":[{"status":"affected","version":"4.0.0","lessThan":"4.0.3","versionType":"semver"},{"status":"affected","version":"3.6.0","lessThan":"3.6.5","versionType":"semver"},{"status":"affected","version":"3.5.0","lessThan":"3.5.9","versionType":"semver"},{"status":"affected","version":"3.4.0","lessThan":"3.4.8","versionType":"semver"},{"status":"affected","version":"3.0.0","lessThan":"3.0.23","versionType":"semver"}],"defaultStatus":"unaffected"}],"modified":"2026-09-29T16:54:39.263Z","provider":"cve","references":["https://openssl-library.org/news/secadv/20260929.txt","https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7","https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166","https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3","https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2026-75805","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T16:54:03.315064Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T16:54:39.263Z"}}],"cna":{"orgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","shortName":"openssl","dateUpdated":"2026-09-29T15:32:20.408Z"}}},"related_cves":[{"value":"CVE-2026-75805","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":null},"priority":{"reasons":[],"severity":"unknown","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"unknown"},"context_update":false}],"next_after":3848,"next_before":3848}