Update04/14/2026

USN-8169-1: Redis, Lua vulnerabilities

Ubuntu Server
Canonical

USN-8169-1: Redis, Lua vulnerabilities

Publication date: 13 April 2026
Overview: Several security issues were fixed in Redis, lua5.1, lua-cjson, lua-bitop.

Packages

lua-bitop - fast bit manipulation library for the Lua language
lua-cjson - JSON parser/encoder for Lua language
lua5.1 - Lua is an embeddable scripting language
redis - Persistent key-value database with network interface

Details
It was discovered that Redis incorrectly handled certain specially crafted
Lua scripts. A remote attacker could possibly use this issue to cause a
denial of service or execute arbitrary code. This issue was only addressed in
lua5.1 on Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2025-49844)

It was discovered that Redis incorrectly handled certain specially crafted
Lua scripts. A remote attacker could possibly use this issue to cause a
denial of service or execute arbitrary code. This issue was only addressed in
lua-bitop on Ubuntu 20.04 LTS and Ubuntu 22.04 LTS and in redis on Ubuntu
16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 24.04 LTS. (CVE-2024-31449)

Seiya Nakata and Yudai Fujiwara discovered that Redis incorrectly handled
certain specially crafted Lua scripts. An attacker could possibly use this
issue to cause heap corruption and execute arbitrary code. This issue was only
addressed in lua-cjson on Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-24834)

Update instructions
In general, a standard system update will make all the necessary changes.

The problem can be corrected by updating your system to the following package versions:

24.04 LTS noble

redis – 5:7.0.15-1ubuntu0.24.04.4
redis-sentinel – 5:7.0.15-1ubuntu0.24.04.4
redis-server – 5:7.0.15-1ubuntu0.24.04.4
redis-tools – 5:7.0.15-1ubuntu0.24.04.4

22.04 LTS jammy

liblua5.1-0 – 5.1.5-8.1ubuntu0.22.04.1~esm1
liblua5.1-0-dev – 5.1.5-8.1ubuntu0.22.04.1~esm1
liblua5.1-bitop-dev – 1.0.2-5ubuntu0.22.04.1~esm2
liblua5.1-bitop0 – 1.0.2-5ubuntu0.22.04.1~esm2
lua-bitop – 1.0.2-5ubuntu0.22.04.1~esm2
lua-bitop-dev – 1.0.2-5ubuntu0.22.04.1~esm2
lua-cjson – 2.1.0+dfsg-2.1ubuntu0.22.04.1~esm2
lua-cjson-dev – 2.1.0+dfsg-2.1ubuntu0.22.04.1~esm2
lua5.1 – 5.1.5-8.1ubuntu0.22.04.1~esm1

20.04 LTS focal

liblua5.1-0 – 5.1.5-8.1ubuntu0.20.04.1~esm1
liblua5.1-0-dev – 5.1.5-8.1ubuntu0.20.04.1~esm1
liblua5.1-bitop-dev – 1.0.2-5ubuntu0.20.04.1~esm2
liblua5.1-bitop0 – 1.0.2-5ubuntu0.20.04.1~esm2
lua-bitop – 1.0.2-5ubuntu0.20.04.1~esm2
lua-bitop-dev – 1.0.2-5ubuntu0.20.04.1~esm2
lua-cjson – 2.1.0+dfsg-2.1ubuntu0.20.04.1~esm2
lua-cjson-dev – 2.1.0+dfsg-2.1ubuntu0.20.04.1~esm2
lua5.1 – 5.1.5-8.1ubuntu0.20.04.1~esm1

18.04 LTS bionic

redis – 5:4.0.9-1ubuntu0.2+esm7
redis-sentinel – 5:4.0.9-1ubuntu0.2+esm7
redis-server – 5:4.0.9-1ubuntu0.2+esm7
redis-tools – 5:4.0.9-1ubuntu0.2+esm7

16.04 LTS

xenial redis-sentinel – 2:3.0.6-1ubuntu0.4+esm5
redis-server – 2:3.0.6-1ubuntu0.4+esm5
redis-tools – 2:3.0.6-1ubuntu0.4+esm5