CVE-2026-23479
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.7 HIGHCVSS: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/M
- EPSS
- 1.36% probability · 70th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- redis/redis
- Source
- security-advisories@github.com
References
- https://github.com/redis/redis/releases/tag/8.6.3Release Notes
- https://github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:14316
- https://access.redhat.com/errata/RHSA-2026:25216
- https://access.redhat.com/errata/RHSA-2026:25219
- https://access.redhat.com/errata/RHSA-2026:25925
- https://access.redhat.com/errata/RHSA-2026:26306
- https://access.redhat.com/errata/RHSA-2026:26540
- https://access.redhat.com/errata/RHSA-2026:7662
- https://access.redhat.com/security/cve/CVE-2026-23479
- https://bugzilla.redhat.com/show_bug.cgi?id=2466780
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23479.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.