CVE-2026-107778 MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()
Authenticated attackers can crash GSS-API services by sending malformed credential arrays, causing denial of service in MIT Kerberos 5.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107778?
CVE-2026-107778 is a high-severity vulnerability in MIT krb5, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2026-107778?
Linux distribution packages (1)
krb5 openSUSE:Tumbleweed | All versions | 1.22.2-5.1 |
How do I fix CVE-2026-107778?
Apply the vendor's patch.
Is CVE-2026-107778 being exploited?
There is no known exploitation of CVE-2026-107778 in the wild and no public exploit code.
Sources
Also known as AZL-106839, BELL-CVE-2026-107778, CLSA-2026-1792097614, DEBIAN-CVE-2026-107778, ECHO-6499-594d-ef91, GHSA-xfjm-wc9w-mmc6 and 5 more.