CVE-2026-23479 redis-server use-after-free in unblock client flow may allow remote code execution
An authenticated attacker can trigger a use-after-free in Redis during client unblocking, 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-2026-23479?
CVE-2026-23479 is a high-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 redis-server from 7.2.0 until 8.6.3, the unblock client flow does not handle an error return from `processCommandAndResetClient` when re-executing a blocked command. If a blocked client is evicted during this flow, an authenticated attacker can trigger a use-after-free that may lead to remote code execution. This has been patched in version 8.6.3.
Weakness: CWE-416
Which versions are affected by CVE-2026-23479?
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 (37)
boost Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-atomic Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-b2 Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-build Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-charconv Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-chrono Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-cobalt Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-container Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-context Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-contract Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-coroutine Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-date-time Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-devel Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-doc Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-doctools Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-examples Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-fiber Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-filesystem Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-graph Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-graph-mpich Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-graph-openmpi Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-iostreams Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-json Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-locale Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-log Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-math Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-mpich Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-mpich-devel Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-mpich-python3 Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-mpich-python3-devel Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-nowide Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-numpy3 Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-openmpi Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-openmpi-devel Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-openmpi-python3 Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-openmpi-python3-devel Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
boost-process Red Hat:hummingbird:1 | All versions | 0:1.90.0-7.hum1 |
Products include Redis Redis.
How do I fix CVE-2026-23479?
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-2026-23479 being exploited?
There is no known exploitation of CVE-2026-23479 in the wild and no public exploit code.
Public exploit code: 4 proofs of concept on GitHub.
Other vulnerabilities in redis
- CVE-2022-0543 Debian-specific Redis Server Lua Sandbox Escape
- 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
- CVE-2023-31655 Denial of service in n/a
Sources
Also known as ALPINE-CVE-2026-23479, AZL-86093, BELL-CVE-2026-23479, BIT-keydb-2026-23479, BIT-redis-2026-23479, BIT-valkey-2026-23479 and 10 more.