{"schemaVersion":3,"id":"CVE-2026-75805","aliases":["ALPINE-CVE-2026-75805","UBUNTU-CVE-2026-75805","DEBIAN-CVE-2026-75805","CGA-2fmp-mv37-h5f5","CGA-35p8-g253-23w7","CGA-4w5w-2m26-5cjp","CGA-6vg6-8725-f4q9","CGA-829r-hhfw-qwfg","CGA-cqc5-4c6w-r47w","CGA-g6g2-x9w9-8ph2","CGA-vh2r-j5r8-9h89"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-09-29T15:32:20.408Z","modified":"2026-09-29T16:54:39.263Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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Pointer Dereference","description":"The product dereferences a pointer that it expects to be valid but is NULL.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/476.html"}],"affected":[{"vendor":"alpine","product":"openssl","name":"openssl","label":"openssl","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/openssl","purlType":"apk","versions":[{"text":"≥ 3.0.0, < 3.3.7-r2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0, < 3.3.7-r2","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl-provider-fips-3.4.0","name":"openssl-provider-fips-3.4.0","label":"openssl-provider-fips-3.4.0","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl-provider-fips-3.4.0","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix 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3.6.5-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"edk2","name":"edk2","label":"edk2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/edk2","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"edk2-hwe","name":"edk2-hwe","label":"edk2-hwe","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/edk2-hwe","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"nodejs","name":"nodejs","label":"nodejs","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/nodejs","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix 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