Vulnerability Description
A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-58218
- https://bugzilla.redhat.com/show_bug.cgi?id=2502728
- https://bugzilla.samba.org/show_bug.cgi?id=16115
- https://www.samba.org/samba/security/CVE-2026-58218.html
FAQ
What is CVE-2026-58218?
CVE-2026-58218 is a vulnerability with a CVSS score of 5.3 (MEDIUM). A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit...
How severe is CVE-2026-58218?
CVE-2026-58218 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58218?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.