CVE-2026-58218

Summary

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.

Affected Software

Weaknesses

• CWE-410: Insufficient Resource Pool

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

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

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