Ubuntu USN · USN-8262-1

Lua vulnerability

Published: Fri, 08 May 2026 09:09

CVE-2025-49844

Summary

Lua could be made to crash or run programs as your login if it opened a specially crafted file.

Details

It was discovered that the Lua parser incorrectly handled garbage collection when processing specially crafted Lua scripts. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

Recommended actions per Ubuntu release

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

Ubuntu xenial

lua5.1→5.1.5-8ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 5.1.5-8ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y lua5.1
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
liblua5.1-0→5.1.5-8ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 5.1.5-8ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y liblua5.1-0
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
liblua5.1-0-dev→5.1.5-8ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 5.1.5-8ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y liblua5.1-0-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
lua5.1→5.1.5-8ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 5.1.5-8ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y lua5.1
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
lua5.1-doc→5.1.5-8ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 5.1.5-8ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y lua5.1-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8262-1?

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-8262-1 (and any other live CVE) applies. Anonymous, no signup.

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

Form-based quickscan Read the bash source first

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