CVE-2026-23631 redis-server Lua use-after-free may allow remote code execution
An authenticated attacker can trigger a use-after-free in Redis replicas with read-only disabled, potentially leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23631?
CVE-2026-23631 is a medium-severity use after free vulnerability in redis, published on 5 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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-only is disabled or can be disabled, which may lead to remote code execution. A workaround is to prevent users from executing Lua scripts or avoid using replicas where replica-read-only is disabled. This is patched in version 8.6.3.
Weakness: CWE-416
Which versions are affected by CVE-2026-23631?
3 open source packages ship an affected version, including redis, keydb and valkey. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
redis Bitnami | From 7.2.0 | 7.2.14, 7.4.9, 8.2.6, 8.4.3, 8.6.3 |
keydb Bitnami | From 7.2.0 | 7.2.14, 7.4.9, 8.2.6, 8.4.3, 8.6.3 |
valkey Bitnami | All versions | 7.2.13, 8.0.8, 8.1.7, 9.0.4 |
Linux distribution packages (5)
redis Red Hat:rhel_e4s:9.4::appstream | All versions | 0:7.0.12-2.module+el9.4.0+24450+e284b512.8 |
redis-debuginfo Red Hat:rhel_e4s:9.4::appstream | All versions | 0:7.0.12-2.module+el9.4.0+24450+e284b512.8 |
redis-debugsource Red Hat:rhel_e4s:9.4::appstream | All versions | 0:7.0.12-2.module+el9.4.0+24450+e284b512.8 |
redis-devel Red Hat:rhel_e4s:9.4::appstream | All versions | 0:7.0.12-2.module+el9.4.0+24450+e284b512.8 |
redis-doc Red Hat:rhel_e4s:9.4::appstream | All versions | 0:7.0.12-2.module+el9.4.0+24450+e284b512.8 |
Products include Redis Redis.
How do I fix CVE-2026-23631?
Upgrade redis to a fixed version for your release line: 7.2.14, 7.4.9, 8.2.6 or 8.4.3.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-23631 being exploited?
There is no known exploitation of CVE-2026-23631 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in redis
- CVE-2022-0543 Debian-specific Redis Server Lua Sandbox Escape
- CVE-2026-23479 redis-server use-after-free in unblock client flow may allow remote code execution
- CVE-2026-25243 redis-server RESTORE invalid memory access may allow remote code execution
- CVE-2025-62507 Redis: Bug in XACKDEL may lead to stack overflow and potential RCE
- CVE-2025-48367 Redis DoS Vulnerability due to bad connection error handling
Sources
Also known as ALPINE-CVE-2026-23631, AZL-86084, BELL-CVE-2026-23631, BIT-keydb-2026-23631, BIT-redis-2026-23631, BIT-valkey-2026-23631 and 11 more.