{"id":"CVE-2026-40355","details":"In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message.","modified":"2026-07-16T03:31:02.118710262Z","published":"2026-04-28T00:00:00Z","related":["ALSA-2026:16799","ALSA-2026:19145","ALSA-2026:19357","SUSE-SU-2026:1816-1","SUSE-SU-2026:21618-1","SUSE-SU-2026:21629-1","SUSE-SU-2026:22255-1","SUSE-SU-2026:22322-1","SUSE-SU-2026:2449-1","SUSE-SU-2026:2848-1","openSUSE-SU-2026:10729-1","openSUSE-SU-2026:21021-1"],"database_specific":{"cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40355.json","unresolved_ranges":[{"extracted_events":[{"introduced":"1.18"},{"fixed":"1.22.3"}],"source":"AFFECTED_FIELD"},{"source":"CPE_FIELD","extracted_events":[{"introduced":"1.18"},{"fixed":"1.22.3"}]},{"extracted_events":[{"fixed":"1.22.3"}],"source":"DESCRIPTION"}],"cna_assigner":"mitre"},"references":[{"type":"WEB","url":"https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40355.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40355"},{"type":"ADVISORY","url":"https://web.mit.edu/kerberos/advisories/"},{"type":"FIX","url":"https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/krb5/krb5","events":[{"introduced":"0"},{"fixed":"2e75f0d9362fb979f5fc92829431a590a130929f"}],"database_specific":{"cpe":"cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.18.0"},{"last_affected":"1.22.2"}],"source":["CPE_RANGE","REFERENCES"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40355.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}