CVE-2024-10912 Denial of Service in lm-sys/fastchat

High 7.5 Published 20 Mar 2025 Updated 20 Mar 2025

An attacker can cause a denial of service in FastChat by sending a file upload request with an excessively large filename, overwhelming the server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-10912?

CVE-2024-10912 is a high-severity denial of service vulnerability in lm-sys/fastchat, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Denial of Service (DoS) vulnerability exists in the file upload feature of lm-sys/fastchat version 0.2.36. The vulnerability is due to improper handling of form-data with a large filename in the file upload request. An attacker can exploit this by sending a payload with an excessively large filename, causing the server to become overwhelmed and unavailable to legitimate users.

Weakness: CWE-400

Which versions are affected by CVE-2024-10912?

3 open source packages ship an affected version, including fschat. It affects 1 product.

Package	Affected	Fixed in
`fschat` PyPI	All versions to `0.2.36`	None
`fschat` PyPI	All versions to `0.2.36`	None
`fschat` PyPI	All versions to `0.2.36`	None

Products include Lm-Sys Fastchat.

How do I fix CVE-2024-10912?

No fix has been published for CVE-2024-10912 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-10912 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-10912 exists.

Sources

Also known as GHSA-79rp-v9rm-gxm8, PYSEC-2026-1395.