# CVE-2026-58218

## Summary

- **CVE ID:** CVE-2026-58218
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
- **CWE:** CWE-410
- **Published:** Jul 30, 2026
- **Last Modified:** Jul 30, 2026

## 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.

## Affected Products

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-58218)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2502728)
- [CNA](https://bugzilla.samba.org/show_bug.cgi?id=16115)
- [CNA](https://www.samba.org/samba/security/CVE-2026-58218.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.62%
- **EPSS Percentile:** 47.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._