Use After Free in Redis
CVE-2026-23631
Redis is an in-memory data structure store. In all versions of redis-server with Lua scripting, an authenticated attacker can exploit the master-replica synchronization mechanism to trigger a use-after-free on replicas where replica-read-o…
Vulnerability class: Use-After-Free
EPSS: 0.001 (23.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Redis — versions < 8.6.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/redis/redis/security/advisories/GHSA-8ghh-qpmp-7826 (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- https://github.com/redis/redis/releases/tag/8.6.3 (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-23631?
- CVE-2026-23631 is a high-severity vulnerability in Redis, classified under Use After Free. CVSS score: 8.1/10. Published 2026-05-05.
- How severe is CVE-2026-23631?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2026-23631 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.