Use After Free in Lfprojects Valkey
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 lea…
Vulnerability class: Use-After-Free
EPSS: 0.868 (99.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Lfprojects Valkey
- Redis — versions < 8.2.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
Frequently asked questions
- What is CVE-2025-49844?
- CVE-2025-49844 is a critical-severity vulnerability in Lfprojects Valkey, classified under Use After Free. CVSS score: 9.9/10. Published 2025-10-03.
- How severe is CVE-2025-49844?
- Critical severity. CVSS v3 base score is 9.9 out of 10.
- Is CVE-2025-49844 known to be exploited?
- 33 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.