🛡️ CVE-2026-12245 on Alpine — nsd

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.

Distribution advisory

This page covers CVE-2026-12245 as tracked by Alpine, for the package nsd. The fix is available in version 4.14.3-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

ALPINE-CVE-2026-12245 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

ALPINE-CVE-2026-12245 is recorded against 1 package.

nsd (from 4.13.0 up to 4.14.3-r0)

Timeline and source

Published on 25 June 2026 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-06-25

Updated 2026-08-11

Modified 2026-07-08

Fix URL N/A

Affected Packages

Software	From version	Fixed in
nsd	4.13.0	4.14.3-r0

References

ADVISORY https://security.alpinelinux.org/vuln/CVE-2026-12245

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