VULNERABILITY INTELLIGENCE
CVE-2026-58218
CVSS score5.3 MEDIUM
EPSS probability0.78%
CISA KEVNot currently listed
Published2026-07-30
Last modified2026-07-30
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
Weakness classification
- secalert@redhat.com: CWE-410