# CVE-2025-49844

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.

- Page: https://www.vulneraibility.com/cve/CVE-2025-49844
- CVSS: 9.9
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 83.16% (percentile 99.7)
- Unvetted proof-of-concept code on GitHub: 19 GitHub proofs of concept · 1 Nuclei template (first 2025-10-07)
- CISA SSVC: exploitation poc, automatable no, technical impact total (assessed 2026-03-20)
- Weakness: CWE-416
- Published: 2025-10-03

## Affected versions

- redis: affected < 8.2.2

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://github.com/redis/redis/security/advisories/GHSA-4789-qfc9-5f9q
- [other] https://github.com/redis/redis/commit/d5728cb5795c966c5b5b1e0f0ac576a7e69af539
- [other] https://github.com/redis/redis/releases/tag/8.2.2
- [exploit] https://github.com/lastvocher/redis-CVE-2025-49844
- [other] http://www.openwall.com/lists/oss-security/2025/10/07/2

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.