Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redis | Redis | < 6.2.20 |
| Lfprojects | Valkey | < 7.2.11 |
Related Weaknesses (CWE)
References
- https://github.com/redis/redis/commit/d5728cb5795c966c5b5b1e0f0ac576a7e69af539Patch
- https://github.com/redis/redis/releases/tag/8.2.2Release Notes
- https://github.com/redis/redis/security/advisories/GHSA-4789-qfc9-5f9qThird Party Advisory
- http://www.openwall.com/lists/oss-security/2025/10/07/2Mailing ListThird Party Advisory
- https://github.com/lastvocher/redis-CVE-2025-49844
FAQ
What is CVE-2025-49844?
CVE-2025-49844 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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, trigg...
How severe is CVE-2025-49844?
CVE-2025-49844 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-49844?
Check the references section above for vendor advisories and patch information. Affected products include: Redis Redis, Lfprojects Valkey.