CVE-2025-49844
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.
- Exploit odds
- 82.6% chance of exploitation in the next 30 days (EPSS). Higher than most.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 82.6% in the next 30 days (EPSS).
- Severity: 9.9 CRITICAL (CVSS).
- Fix: a patch or advisory is linked.
- It meets the bar for Drop everything: critical, and exploited or very likely to be.
Details
- Published
- Last modified
- Exploit probability
- 82.6% · EPSS, next 30 days
- Weakness
- CWE-416 · Use after free
- Record status
- Modified
Affected
- Redis < 6.2.20
- Redis < 7.2.11
- Redis < 7.4.6
- Redis < 8.0.4
- Redis < 8.2.2
- Lfprojects Valkey < 7.2.11
- Lfprojects Valkey < 8.0.6
- Lfprojects Valkey < 8.1.4
Attack profile CVSS 3.1 · 9.9
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2025-49844.md and follow it. Check whether this project is affected by CVE-2025-49844. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/redis/redis/commit/d5728cb5795c966c5b5b1e0f0ac576a7e69af539
- https://github.com/redis/redis/releases/tag/8.2.2
- https://github.com/redis/redis/security/advisories/GHSA-4789-qfc9-5f9q
References
- https://github.com/redis/redis/commit/d5728cb5795c966c5b5b1e0f0ac576a7e69af539
- 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