CVE-2025-49844
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 82.6%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 9.9 CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 82.64% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- redis/redis · lfprojects/valkey
- Source
- security-advisories@github.com
EPSS 82.6% since 1 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.