Ubuntu USN · USN-8474-1

NSD vulnerabilities

Published: Thu, 25 Jun 2026 12:38

CVE-2026-12490CVE-2026-12245CVE-2026-12244CVE-2026-12246

Summary

NSD could be made to crash or run programs if it received specially crafted network traffic.

Details

It was discovered that NSD incorrectly handled APL resource records with an address length larger than permitted for the address family. A remote attacker could use this to cause a stack-based buffer overflow when the zone is written to disk, potentially executing arbitrary code with the privileges of the NSD server. (CVE-2026-12246) It was discovered that NSD incorrectly handled SVCB resource records. A remote attacker could use this to cause a heap overflow, potentially executing arbitrary code with the privileges of the NSD server. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-12244) It was discovered that NSD had a use-after-free vulnerability in TLS connection error logging. A remote attacker could use this to cause a denial of service by crashing the server process. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-12245) It was discovered that NSD incorrectly handled TLS authentication for zone transfers. An attacker could bypass transfer security restrictions when certain conditions were met. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-12490)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu bionic

nsd→4.1.17-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.1.17-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.1.17-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
nsd→4.1.17-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.1.17-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.1.17-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu focal

nsd→4.1.26-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.1.26-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.1.26-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
nsd→4.1.26-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.1.26-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.1.26-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu jammy

nsd→4.3.9-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.3.9-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.3.9-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
nsd→4.3.9-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.3.9-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.3.9-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu noble

nsd→4.8.0-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.8.0-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.8.0-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
nsd→4.8.0-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.8.0-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.8.0-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu resolute

nsd→4.14.0-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.14.0-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.14.0-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
nsd→4.14.0-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.14.0-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.14.0-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu xenial

nsd→4.1.7-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.1.7-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.1.7-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
nsd→4.1.7-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.1.7-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd=4.1.7-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
nsd3→4.1.7-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 4.1.7-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y nsd3=4.1.7-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

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