CVE-2025-49844: Redis Lua Use-After-Free may lead to remote code execution
Redis is an open source, in-memory database that persists on disk. Versions 8.2.1 and below allow an authenticated user to use a specially crafted Lua script to manipulate the garbage collector, trigger a use-after-free and potentially lead to remote code execution. The problem exists in all versions of Redis with Lua scripting. This issue is fixed in version 8.2.2. To workaround this issue without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.
Other sources
Redis Lua Use-After-Free may lead to remote code execution
— Microsoft
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-49844?
CVE-2025-49844 is classified as a high severity vulnerability due to its potential for remote code execution.
How do I fix CVE-2025-49844?
To fix CVE-2025-49844, upgrade Redis to version 8.2.2 or later.
Who is affected by CVE-2025-49844?
CVE-2025-49844 affects Redis versions 8.2.1 and below.
What type of attack can be executed through CVE-2025-49844?
CVE-2025-49844 allows an authenticated user to execute a specially crafted Lua script that can lead to remote code execution.
What components are involved in the exploitation of CVE-2025-49844?
Exploitation of CVE-2025-49844 involves manipulating the garbage collector, leading to a use-after-free condition.