CVE-2026-23479
redis-server use-after-free in unblock client flow may allow remote code execution
- State
- Published
- Severity
- 7.7 High
- Published
- May 5, 2026
- Updated
- Jul 16, 2026
- Reserved
- Jan 13, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | 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 | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
redisredis |
|
References
- https://github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3
- https://github.com/redis/redis/releases/tag/8.6.3
- https://access.redhat.com/security/cve/CVE-2026-23479vdb-entry
- RHBZ#2466780issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23479.json
- https://access.redhat.com/errata/RHSA-2026:26540vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25216vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:26306vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25219vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25925vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7662vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:14316vendor-advisory
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