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.
Affected products
redis: redis
References10
- github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3 Vendor Advisory
- github.com/redis/redis/releases/tag/8.6.3 Release Notes
- access.redhat.com/errata/RHSA-2026:14316
- access.redhat.com/errata/RHSA-2026:25216
- access.redhat.com/errata/RHSA-2026:25219
- access.redhat.com/errata/RHSA-2026:25925
- access.redhat.com/errata/RHSA-2026:26306
- access.redhat.com/errata/RHSA-2026:26540
- access.redhat.com/errata/RHSA-2026:7662
- access.redhat.com/security/cve/CVE-2026-23479
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
7.7
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 3% percentile: 86 · as of 13 November 2026
- CWE
- CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.