CVE-2025-49844
Critical
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.
SeverityCritical
CVSS9.9
Exploit probability100. percentile82.6%
Product
Redis
PublishedOct 3, 2025
First seenOct 3, 2025
Weakness typeCWE-416Use after free
How to fix
Update
- redis redis6.2.20, 7.2.11, 7.4.6, 8.0.4, 8.2.2 or later
- lfprojects valkey7.2.11, 8.0.6, 8.1.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redis redis | v < 6.2.20, 7.0 ≤ v < 7.2.11, 7.4.0 ≤ v < 7.4.6, 8.0.0 ≤ v < 8.0.4, 8.2.0 ≤ v < 8.2.2 | 6.2.20, 7.2.11, 7.4.6, 8.0.4, 8.2.2 |
| lfprojects valkey | v < 7.2.11, 8.0.0 ≤ v < 8.0.6, 8.1.0 ≤ v < 8.1.4 | 7.2.11, 8.0.6, 8.1.4 |
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