CVE-2026-107778

Name	CVE-2026-107778
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
krb5 (PTS)	bookworm, bookworm (security)	1.20.1-2+deb12u5	vulnerable
	trixie (security), trixie	1.21.3-5+deb13u1	vulnerable
	forky, sid	1.22.1-3	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
krb5	source	(unstable)	(unfixed)

Notes

https://github.com/krb5/krb5/pull/1511
Fixed by: https://github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08 (master)
Fixed by: https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a (krb5-1.22 branch)