---
title: "CVE-2025-49844: Redis Lua Use-After-Free may lead to remote code execution"
url: https://erroneo.us/security/cve/CVE-2025-49844/
description: "CVE-2025-49844 (redis redis): Redis is an open source, in-memory database that persists on disk. Versions 8.2.1 and below allow an authenticated user to use…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-10-03
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-49844"
kev: false
cvss: 10
epss: 0.82294
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-49844: Redis Lua Use-After-Free may lead to remote code execution

**Signal:** High exploit likelihood. EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 82.3% , percentile 99.7: FIRST’s model estimates a 82.3% chance of exploitation activity in the next 30 days, higher than 99.7% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Editorial verdict: Patch this week. RediShell: 13-Year-Old Lua Use-After-Free RCE in Redis — Exploitation needs an authenticated session, so properly locked-down Redis can be patched in a normal urgent window; instances reachable without a password are effectively unauthenticated RCE and should be fixed today.

## What it is

Redis is an open source, in-memory database that persists on disk. Versions 8.2.1 and below allow an authenticated user to use a specially crafted Lua script to manipulate the garbage collector, trigger a use-after-free and potentially lead to remote code execution. The problem exists in all versions of Redis with Lua scripting. This issue is fixed in version 8.2.2. To workaround this issue without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.

## Affected products (CVE record)

- redis redis: < 8.2.2

## Severity

- GitHub_M CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 82.29% probability of exploitation activity in the next 30 days; percentile 99.7.

## Sources

- [CVE.org record CVE-2025-49844](https://www.cve.org/CVERecord?id=CVE-2025-49844)
- [NVD entry CVE-2025-49844](https://nvd.nist.gov/vuln/detail/CVE-2025-49844)
- [github.com](https://github.com/redis/redis/security/advisories/GHSA-4789-qfc9-5f9q)
- [github.com](https://github.com/redis/redis/commit/d5728cb5795c966c5b5b1e0f0ac576a7e69af539)
- [github.com](https://github.com/redis/redis/releases/tag/8.2.2)
- [github.com](https://github.com/lastvocher/redis-CVE-2025-49844)
- [openwall.com](http://www.openwall.com/lists/oss-security/2025/10/07/2)

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Source page: https://erroneo.us/security/cve/CVE-2025-49844/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt