CVE-2025-49844

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 v3.1 Score

9.9

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
redis	redis	< 6.2.20
redis	redis	7.0 — 7.2.11
redis	redis	7.4.0 — 7.4.6
redis	redis	8.0.0 — 8.0.4
redis	redis	8.2.0 — 8.2.2
lfprojects	valkey	< 7.2.11
lfprojects	valkey	8.0.0 — 8.0.6
lfprojects	valkey	8.1.0 — 8.1.4

References

Advisories & Patches

https://github.com/redis/redis/commit/d5728cb5795c966c5b5b1e0f0ac576a7e69af539

Other References

https://github.com/redis/redis/releases/tag/8.2.2 https://github.com/redis/redis/security/advisories/GHSA-4789-qfc9-5f9q http://www.openwall.com/lists/oss-security/2025/10/07/2 https://github.com/lastvocher/redis-CVE-2025-49844

Frequently Asked Questions

What is CVE-2025-49844? +

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. It has a CVSS v3.1 base score of 9.9 (CRITICAL).

How severe is CVE-2025-49844? +

CVE-2025-49844 has a CVSS v3.1 score of 9.9 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-49844? +

CVE-2025-49844 affects products from lfprojects, redis, specifically: redis, valkey. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-49844? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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