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CVE WatchJul 30, 2026

CVE-2026-58218

A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before be

CVSS

5.3

Medium

EPSS

—

KEV

—

Exploit Today

—

0-100

Published: Jul 30, 2026 · Last modified: Jul 30, 2026 · CWE-410

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references
Related CVEs

No related CVEs by CWE or product.