# CVE-2026-12245: nsd: NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the se...

CVE-2026-12245 is fixed in nsd on 1 platform, first by nsd 4.14.0-1ubuntu0.1~esm1, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-12245
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 24, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | nsd Debian 14 | 4.14.3-1 | [DEBIAN-CVE-2026-12245](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12245.md) | Jun 28, 2026 |
| Linux | nsd Ubuntu 26.04.1 LTS (resolute) | 4.14.0-1ubuntu0.1~esm1 | [nsd 4.14.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-nsd-4.14.0-1ubuntu0.1-esm1.md) | Jun 24, 2026 |
| Linux | nsd opensuse-leap 16.0 | 4.14.3-bp160.1.1 | [OPENSUSE-SU-2026:21502-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21502-1.md) | Jul 29, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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