Ubuntu USN · USN-8449-1

ldns vulnerability

Published: Thu, 18 Jun 2026 13:33

CVE-2026-10846

Summary

ldns could be made to accept spoofed DNS responses.

Details

Pablo Ruiz discovered that ldns did not properly validate DNS responses when used as a stub resolver over UDP. A remote attacker could possibly use this issue to inject arbitrary DNS responses.

Recommended actions per Ubuntu release

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

Ubuntu bionic

ldns→1.7.0-3ubuntu4.1+esm1apt_upgrade
Standard apt upgrade. Install 1.7.0-3ubuntu4.1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
ldnsutils→1.7.0-3ubuntu4.1+esm1apt_upgrade
Standard apt upgrade. Install 1.7.0-3ubuntu4.1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldnsutils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns-dev→1.7.0-3ubuntu4.1+esm1apt_upgrade
Standard apt upgrade. Install 1.7.0-3ubuntu4.1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns2→1.7.0-3ubuntu4.1+esm1apt_upgrade
Standard apt upgrade. Install 1.7.0-3ubuntu4.1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns2
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-ldns→1.7.0-3ubuntu4.1+esm1apt_upgrade
Standard apt upgrade. Install 1.7.0-3ubuntu4.1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-ldns→1.7.0-3ubuntu4.1+esm1apt_upgrade
Standard apt upgrade. Install 1.7.0-3ubuntu4.1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu focal

ldns→1.7.0-4.1ubuntu1+esm2apt_upgrade
Standard apt upgrade. Install 1.7.0-4.1ubuntu1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
ldnsutils→1.7.0-4.1ubuntu1+esm2apt_upgrade
Standard apt upgrade. Install 1.7.0-4.1ubuntu1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldnsutils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns-dev→1.7.0-4.1ubuntu1+esm2apt_upgrade
Standard apt upgrade. Install 1.7.0-4.1ubuntu1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns2→1.7.0-4.1ubuntu1+esm2apt_upgrade
Standard apt upgrade. Install 1.7.0-4.1ubuntu1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns2
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-ldns→1.7.0-4.1ubuntu1+esm2apt_upgrade
Standard apt upgrade. Install 1.7.0-4.1ubuntu1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-ldns→1.7.0-4.1ubuntu1+esm2apt_upgrade
Standard apt upgrade. Install 1.7.0-4.1ubuntu1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu jammy

ldns→1.7.1-2ubuntu4+esm2apt_upgrade
Standard apt upgrade. Install 1.7.1-2ubuntu4+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
ldnsutils→1.7.1-2ubuntu4+esm2apt_upgrade
Standard apt upgrade. Install 1.7.1-2ubuntu4+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldnsutils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns-dev→1.7.1-2ubuntu4+esm2apt_upgrade
Standard apt upgrade. Install 1.7.1-2ubuntu4+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns3→1.7.1-2ubuntu4+esm2apt_upgrade
Standard apt upgrade. Install 1.7.1-2ubuntu4+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns3
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-ldns→1.7.1-2ubuntu4+esm2apt_upgrade
Standard apt upgrade. Install 1.7.1-2ubuntu4+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu noble

ldns→1.8.3-2ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.8.3-2ubuntu0.1~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 ldns=1.8.3-2ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
ldnsutils→1.8.3-2ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.8.3-2ubuntu0.1~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 ldnsutils=1.8.3-2ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
libldns-dev→1.8.3-2ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.8.3-2ubuntu0.1~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 libldns-dev=1.8.3-2ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
libldns3t64→1.8.3-2ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.8.3-2ubuntu0.1~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 libldns3t64=1.8.3-2ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
python3-ldns→1.8.3-2ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.8.3-2ubuntu0.1~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 python3-ldns=1.8.3-2ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu resolute

ldns→1.8.4-2ubuntu0.26.04.1~esm1apt_upgrade_esm
Fixed at 1.8.4-2ubuntu0.26.04.1~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 ldns=1.8.4-2ubuntu0.26.04.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
ldnsutils→1.8.4-2ubuntu0.26.04.1~esm1apt_upgrade_esm
Fixed at 1.8.4-2ubuntu0.26.04.1~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 ldnsutils=1.8.4-2ubuntu0.26.04.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
libldns-dev→1.8.4-2ubuntu0.26.04.1~esm1apt_upgrade_esm
Fixed at 1.8.4-2ubuntu0.26.04.1~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 libldns-dev=1.8.4-2ubuntu0.26.04.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
libldns3t64→1.8.4-2ubuntu0.26.04.1~esm1apt_upgrade_esm
Fixed at 1.8.4-2ubuntu0.26.04.1~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 libldns3t64=1.8.4-2ubuntu0.26.04.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
python3-ldns→1.8.4-2ubuntu0.26.04.1~esm1apt_upgrade_esm
Fixed at 1.8.4-2ubuntu0.26.04.1~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 python3-ldns=1.8.4-2ubuntu0.26.04.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu xenial

ldns→1.6.17-8ubuntu0.1+esm2apt_upgrade
Standard apt upgrade. Install 1.6.17-8ubuntu0.1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
ldnsutils→1.6.17-8ubuntu0.1+esm2apt_upgrade
Standard apt upgrade. Install 1.6.17-8ubuntu0.1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ldnsutils
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns-dev→1.6.17-8ubuntu0.1+esm2apt_upgrade
Standard apt upgrade. Install 1.6.17-8ubuntu0.1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libldns1→1.6.17-8ubuntu0.1+esm2apt_upgrade
Standard apt upgrade. Install 1.6.17-8ubuntu0.1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libldns1
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-ldns→1.6.17-8ubuntu0.1+esm2apt_upgrade
Standard apt upgrade. Install 1.6.17-8ubuntu0.1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-ldns
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8449-1?

5-second check on your actual server. Reads /etc/os-release, uname -r, and dpkg-query; matches against the live USN + Debian Security Tracker feeds; tells you whether USN-8449-1 (and any other live CVE) applies. Anonymous, no signup.

curl https://mindsparkstack.com/scan.sh | bash

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