CVE-2025-49844
Redis Lua Use-After-Free may lead to remote code execution
- Published
- Oct 3, 2025
- Updated
- Mar 20, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 6, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
16CVE-2025-49844
- CVE-2025-49844Scanner
Scanner and educational guide for CVE-2025-49844 (RediShell), a Redis Lua scripting use-after-free vulnerability. Checks Redis servers for exposure, provides remediation steps, and explains the exploit mechanics for learning purposes.
- CVE-2025-49844Exploit
Responsible use
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