Medium severity · published Oct 8, 2026
CVE-2026-107778
MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KR
krb5 · MIT
through 1.22.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107778
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107778
issue-tracking
https://github.com/krb5/krb5/pull/1511
patch
https://github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08
patch
https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a
technical-description
https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c#L77-L112
product
https://github.com/krb5/krb5
third-party-advisory
https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-rd-cred
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