CVE-2026-107778

MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()

State: Published
Severity: 7.1 High
Published: Oct 8, 2026
Updated: Oct 9, 2026
Reserved: Oct 8, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
krb5MIT	1.22.2 and earlierAffected

References

Pull Request #1511issue-trackingpatch
Patch Commitpatch
https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282apatch
https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c#L77-L112technical-description
https://github.com/krb5/krb5product
VulnCheck Advisory: MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()third-party-advisory

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