---
id: CVE-2026-23479
title: Redis is an in-memory data structure store
summary: >-
  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 e…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
  - CWE-416
vendor: redis
product: redis
affected:
  - 'redis >= 7.2.0, < 8.6.3'
patched:
  - redis 8.6.3
published: '2026-05-05'
updated: '2026-07-16'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-23479'
references:
  - url: 'https://github.com/redis/redis/releases/tag/8.6.3'
    label: security-advisories@github.com
  - url: 'https://github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3'
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14316'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:25216'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:25219'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:25925'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:26306'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:26540'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:7662'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-23479'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2466780'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23479.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
  - exploit-available
epss: 0.01506
epssPercentile: 0.73289
ingestedAt: '2026-07-16T12:53:56.043Z'
exploits:
  github: 4
  githubRepos:
    - 'https://github.com/HackSpeak/CVE-2026-23479'
    - 'https://github.com/pduggusa/redis-cve-2026-23479-check'
    - 'https://github.com/v1c0mmrt/redis-cve-2026-23479-scanner'
  checkedAt: '2026-09-26T09:05:40.380Z'
exploitAvailable: true
---

## Overview

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

- `redis >= 7.2.0, < 8.6.3`

## Remediation

Upgrade past the affected range:

- `redis 8.6.3`