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redis-server use-after-free in unblock client flow may allow remote code execution

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-23479
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 23:58 UTC · Revision 1

Source evidence

redis-server use-after-free in unblock client flow may allow remote code execution

core-osv · Original source

Published 5 May 2026, 16:36 UTC

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.

osv:CVE-2026-23479
Complete source record
{
  "id": "29be245e275e1ae6736e240a72c9058b61ab044ba7c763f978c14da5b4d2aa55",
  "url": "https://osv.dev/vulnerability/CVE-2026-23479",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "redis-server use-after-free in unblock client flow may allow remote code execution",
    "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 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.",
    "evidence": "osv:CVE-2026-23479",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-23479",
      "aliases": [
        "BIT-keydb-2026-23479",
        "BIT-redis-2026-23479",
        "BIT-valkey-2026-23479",
        "CVE-2026-23479",
        "GHSA-93m2-935m-8rj3"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/redis/redis",
              "type": "GIT",
              "events": [
                {
                  "introduced": "29622276ecd7b74312798e6772744858a8a6f9bf"
                },
                {
                  "fixed": "bd3b38d41070b478c58bc8b72d2af89cbccd1a40"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "7.2.0"
                      },
                      {
                        "fixed": "8.6.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "bd3b38d41070b478c58bc8b72d2af89cbccd1a40"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "8.6.3"
                  },
                  {
                    "cpe": "cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "7.2.0"
                      },
                      {
                        "fixed": "8.6.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23479.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.526327368Z",
      "provider": "osv",
      "references": [
        "https://github.com/redis/redis/releases/tag/8.6.3",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23479.json",
        "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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23479.json",
        "https://github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23479",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2466780"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23479.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23479",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491014,
  "published_at": "2026-05-05T16:36:05.486+00:00"
}