CVE-2025-49844

high-risk

Published 2025-10-03

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.

Do I need to act?

14.2% chance of exploitation in next 30 days

EPSS score — higher than 86% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Fix available

Upgrade to: 9829bdbfd9e7eeb8fb6c79ce36bcc77a681824b1, 5f4bae3ea10174a7c872cc099c953b0e91afa93a

CVSS 9.9/10 Critical

NETWORK / LOW complexity

Affected Products (2)

Redis

Valkey

Affected Vendors

Redis Lfprojects

References (5)

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

Release Notes https://github.com/redis/redis/releases/tag/8.2.2

Third Party Advisory https://github.com/redis/redis/security/advisories/GHSA-4789-qfc9-5f9q

Mailing List http://www.openwall.com/lists/oss-security/2025/10/07/2

https://github.com/lastvocher/redis-CVE-2025-49844

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high-risk

Severity 33/34 · Critical

Exploitability 12/34 · Low

Exposure 7/34 · Low