{"cve":"CVE-2026-40355","nvd":{"published":"2026-04-28T06:16:03.663","modified":"2026-10-15T02:19:22.700","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-476"],"references":["https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html","https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f","https://web.mit.edu/kerberos/advisories/","https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html"],"products":["mit:kerberos_5"],"source":"nvd","synced_at":"2026-10-19T22:33:09.003606135+00:00"},"epss":{"cve":"CVE-2026-40355","score":0.00645,"percentile":0.50637,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}