What’s Vulnerable › Vulnerabilities

CVE-2026-23479: redis-server use-after-free in unblock client flow may allow remote code execution

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% 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 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: from 7.2.0 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

• https://github.com/redis/redis/releases/tag/8.6.3
• https://github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3
• 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

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