# CVE-2026-23631 — redis

> As of 2026-07-16, CVE-2026-23631 is a HIGH-severity vulnerability in redis, CVSS v3.1 8.8, EPSS 2.8% (86.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-23631, most recently “Redis DarkReplica (CVE-2026-23631) — Post-Auth RCE via Lua Functions-Engine Use-After-Free During Master-Replica Sync”.

**Last updated:** 2026-07-16

## What is CVE-2026-23631?

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.

The record classifies CVE-2026-23631 under weakness class [CWE-416](https://intel.threadlinqs.com/cwe/CWE-416). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 158 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 6.1 (`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`)
- **EPSS (FIRST):** 2.8% probability of exploitation in the next 30 days, higher than 86.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 9.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-05-05, last modified 2026-07-16

## Is CVE-2026-23631 being exploited?

Weaponised exploit code for CVE-2026-23631 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

- [yoyosh/DarkReplica](https://github.com/yoyosh/DarkReplica) (github)
- [HORKimhab/CVE-2026-23631](https://github.com/HORKimhab/CVE-2026-23631) (github)

## Affected products and versions

- [redis](https://intel.threadlinqs.com/vendors/redis): redis

## How to fix CVE-2026-23631

No vendor patch reference has been recorded for CVE-2026-23631 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-23631

1 tracked threat in the Threadlinqs corpus references CVE-2026-23631, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Redis DarkReplica (CVE-2026-23631) — Post-Auth RCE via Lua Functions-Engine Use-After-Free During Master-Replica Sync](https://intel.threadlinqs.com/threat/TL-2026-0713) — HIGH · 2026-06-08

## Sources

Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [github.com](https://github.com/redis/redis/security/advisories/GHSA-8ghh-qpmp-7826)

**Other references**

- [github.com](https://github.com/redis/redis/releases/tag/8.6.3)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-23631
Full detection coverage and IOCs for threats exploiting CVE-2026-23631 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp