What’s Vulnerable › Vulnerabilities

CVE-2026-107778: MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-08 · updated 2026-10-09
• Weakness: CWE-476

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.

Affected products

• MIT krb5: through 1.22.2

References

• https://github.com/krb5/krb5
• https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c#L77-L112
• https://github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08
• https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a
• https://github.com/krb5/krb5/pull/1511
• https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-rd-cred

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