CVE-2026-23631

Published May 5, 2026

Last updated a month ago

Redis

Database

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-23631, also known as "DarkReplica," is a use-after-free vulnerability found in Redis, an in-memory data structure store. This flaw specifically impacts versions of `redis-server` that utilize Lua scripting. An authenticated attacker can exploit the master-replica synchronization mechanism to trigger the use-after-free condition on replicas where the `replica-read-only` setting is either disabled or can be disabled. Successful exploitation of this vulnerability can lead to remote code execution. The issue was discovered during a ZeroDay.Cloud 2025 research effort and has since been patched in Redis version 8.6.3. A recommended workaround involves preventing users from executing Lua scripts or avoiding the use of replicas where `replica-read-only` is not enabled.

Description: Redis is an in-memory data structure store. In all versions of redis-server with Lua scripting, an authenticated attacker can exploit the master-replica synchronization mechanism to trigger a use-after-free on replicas where replica-read-only is disabled or can be disabled, which may lead to remote code execution. A workaround is to prevent users from executing Lua scripts or avoid using replicas where replica-read-only is disabled. This is patched in version 8.6.3.
Source: security-advisories@github.com
NVD status: Analyzed
Products: redis

Risk scores

CVSS 4.0

Type: Secondary
Base score: 6.1
Impact score: -
Exploitability score: -
Vector string: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity: MEDIUM

CVSS 3.1

Type: Primary
Base score: 8.1
Impact score: 5.2
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Severity: HIGH

Weaknesses

security-advisories@github.com: CWE-416

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "D27823C5-96F2-4D85-89CF-9C5DEAC584E3",
            "versionEndExcluding": "8.6.3",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.