CVE-2026-23631: redis-server Lua use-after-free may allow remote code execution

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-05 · updated 2026-07-25
Weakness: CWE-416

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.

Affected products

Redis: before 8.6.3 — fixed in 8.6.3

How to fix

Upgrade to a fixed version: Redis 8.6.3. Check the vendor advisory for mitigations.

References

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