CVE-2025-49844

Name: CVE-2025-49844
Creator: NVD / NIST
Published: 2025-10-03T20:15:32.823+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 86.27%

Last modified Jun 17, 2026

CVE-2025-49844 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. 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. EPSS estimates a 86.27% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.9/10

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

EPSS Probability

86.27%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

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

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 List, Third Party Advisory
https://github.com/lastvocher/redis-CVE-2025-49844

Timeline

Published: Oct 3, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-49844?

How severe is CVE-2025-49844?

CVE-2025-49844 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 86.27% probability of exploitation in the next 30 days.

How do I fix CVE-2025-49844?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-49844?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST