krb5 security update (CVE-2026-107778)
Description
A vulnerability in MIT Kerberos 5 (krb5) through version 1.22.2 allows authenticated clients to cause a denial of service by triggering a NULL pointer dereference. This occurs when mismatched KRB-CRED arrays are sent, specifically when forwarded credentials contain more tickets than ticket_info entries, crashing GSS-API acceptor services.
CVSS v3.1
Score 6.5medium
Affected software
pkg:rpm/openEuler/krb5&distro=openEuler-22.03-LTS-SP4Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-107778 is a denial of service vulnerability in MIT Kerberos 5 (krb5) through version 1.22.2. The flaw exists in the make_cred_list() function within rd_cred.c, where a NULL pointer dereference can be triggered by an authenticated client sending mismatched KRB-CRED arrays. Attackers exploit this by sending forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context(), causing the GSS-API acceptor services to crash.
Potential Impact
An authenticated Kerberos client can crash services that accept GSS-API security contexts, resulting in denial of service. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
A patch is available to fix this vulnerability. Users should upgrade to a fixed version of MIT Kerberos 5 beyond 1.22.2 or the version specified by their vendor. No other mitigation is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- OESA-2026-4494
- Osv Schema Version
- 1.7.2
- Ecosystems
- ["openEuler:22.03-LTS-SP4"]
- Database Specific Severity
- Medium
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ada44ce4d27ba8daa6a4a02
Added to database: 10/22/2026, 17:15:58 UTC
Last enriched: 10/22/2026, 17:21:31 UTC
Last updated: 10/22/2026, 17:21:31 UTC
Views: 3
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