NULL pointer dereference in Mit Krb5
CVE-2026-107778
MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/krb5/krb5/pull/1511 (issue-tracking, patch)
- github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08 (patch)
- github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a (patch)
- github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c (technical-description)
- github.com/krb5/krb5 (product)
- www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-107778?
- CVE-2026-107778 is a medium-severity vulnerability in Mit Krb5, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-10-08.
- How severe is CVE-2026-107778?
- Medium severity. CVSS v3 base score is 6.5 out of 10.