{"id":"DEBIAN-CVE-2026-75805","details":"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 \u003cfile\u003e' 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 certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected.  FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.","modified":"2026-09-30T08:00:11.005464752Z","published":"2026-09-29T16:17:11.063Z","upstream":["CVE-2026-75805"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-75805"}],"affected":[{"package":{"name":"openssl","ecosystem":"Debian:12","purl":"pkg:deb/debian/openssl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.10-1","3.0.10-1~deb12u1","3.0.11-1","3.0.11-1~deb12u1","3.0.11-1~deb12u2","3.0.12-1","3.0.12-2","3.0.13-1~deb12u1","3.0.13-1~deb12u2","3.0.14-1~deb12u1","3.0.14-1~deb12u2","3.0.15-1~deb12u1","3.0.16-1~deb12u1","3.0.17-1~deb12u1","3.0.17-1~deb12u2","3.0.17-1~deb12u3","3.0.18-1~deb12u1","3.0.18-1~deb12u2","3.0.19-1~deb12u1","3.0.19-1~deb12u2","3.0.20-1~deb12u1","3.0.20-1~deb12u2","3.0.22-1~deb12u1","3.0.9-1","3.1.0-1","3.1.1-1","3.1.2-1","3.1.3-1","3.1.4-1","3.1.4-2","3.1.5-1","3.1.5-1.1","3.1.5-1.1+hurd.1","3.2.0-1","3.2.0-2","3.2.1-1","3.2.1-1.1~exp1","3.2.1-2","3.2.1-3","3.2.2-1","3.3.0-1","3.3.0~beta1-1","3.3.1-1","3.3.1-2","3.3.1-5","3.3.1-6","3.3.1-7","3.3.2-1","3.3.2-2","3.4.0-1","3.4.0-2","3.4.0~~beta1-1","3.4.0~~beta1-2","3.4.1-1","3.5.0-1","3.5.0-2","3.5.0-3","3.5.0~~alpha1-1","3.5.0~~beta1-1","3.5.1-1","3.5.2-1","3.5.3-1","3.5.4-1","3.5.4-1~deb13u1","3.5.4-1~deb13u2","3.5.5-1","3.5.5-1~deb13u1","3.5.5-1~deb13u2","3.5.6-1~deb13u1","3.5.6-1~deb13u2","3.5.7-1~deb13u1","3.5.7-1~deb13u2","3.5.7-1~deb13u3","3.6.0-1","3.6.0-2","3.6.0~~alpha1-1","3.6.0~~beta1-1","3.6.1-1","3.6.1-2","3.6.1-3","3.6.2-1","3.6.3-1","3.6.4-1","3.6.5-1","4.0.0-1","4.0.0~alpha1-1","4.0.0~beta1-1","4.0.1-1","4.0.2-1","4.0.3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75805.json"}},{"package":{"name":"openssl","ecosystem":"Debian:13","purl":"pkg:deb/debian/openssl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.7-1~deb13u3"}]}],"versions":["3.5.1-1","3.5.1-1+deb13u1","3.5.2-1","3.5.3-1","3.5.4-1","3.5.4-1~deb13u1","3.5.4-1~deb13u2","3.5.5-1","3.5.5-1~deb13u1","3.5.5-1~deb13u2","3.5.6-1~deb13u1","3.5.6-1~deb13u2","3.5.7-1~deb13u1","3.5.7-1~deb13u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75805.json"}},{"package":{"name":"openssl","ecosystem":"Debian:14","purl":"pkg:deb/debian/openssl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.1-1","3.5.2-1","3.5.3-1","3.5.4-1","3.5.4-1~deb13u1","3.5.4-1~deb13u2","3.5.5-1","3.5.5-1~deb13u1","3.5.5-1~deb13u2","3.5.6-1~deb13u1","3.5.6-1~deb13u2","3.5.7-1~deb13u1","3.5.7-1~deb13u2","3.5.7-1~deb13u3","3.6.0-1","3.6.0-2","3.6.0~~alpha1-1","3.6.0~~beta1-1","3.6.1-1","3.6.1-2","3.6.1-3","3.6.2-1","3.6.3-1","3.6.4-1","3.6.5-1","4.0.0-1","4.0.0~alpha1-1","4.0.0~beta1-1","4.0.1-1","4.0.2-1","4.0.3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75805.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}