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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-58218 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://access.redhat.com/security/cve/CVE-2026-58218 Red Hat, Inc.
https://bugzilla.redhat.com/show_bug.cgi?id=2502728 Red Hat, Inc.
https://bugzilla.samba.org/show_bug.cgi?id=16115 Red Hat, Inc.
https://www.samba.org/samba/security/CVE-2026-58218.html Red Hat, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-410 Insufficient Resource Pool Red Hat, Inc.  

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-58218
NVD Published Date:
07/30/2026
NVD Last Modified:
07/30/2026
Source:
Red Hat, Inc.