fastchatGHSA-qg86-f892-m4hj
FastChat Uncontrolled Resource Consumption vulnerability
High7.5CVE-2024-10907 · Published Mar 20, 2025 · updated Jul 7, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| fschat PyPI | <= 0.2.36 | No fix yet |
Details and references
In lm-sys/fastchat Release v0.2.36, the server fails to handle excessive characters appended to the end of multipart boundaries. This flaw can be exploited by sending malformed multipart requests with arbitrary characters at the end of the boundary. Each extra character is processed in an infinite loop, leading to excessive resource consumption and a complete denial of service (DoS) for all users. The vulnerability is unauthenticated, meaning no user login or interaction is required for an attacker to exploit this issue.
More fastchat advisories
All| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Mar 202025 | FastChat open redirect vulnerability CVE-2024-10908Medium6.1no fix yet | Medium6.1 | No fix yet |
| Mar 202025 | FastChat Denial of Service vulnerability CVE-2024-10912High7.5no fix yet | High7.5 | No fix yet |
| Mar 202025 | FastChat Server-Side Request Forgery vulnerability CVE-2024-11603High7.5no fix yet | High7.5 | No fix yet |
| Mar 202025 | FastChat Server-Side Request Forgery vulnerability CVE-2024-12376High7.5no fix yet | High7.5 | No fix yet |
| Apr 20 | FastChat has Denial of Service Through Blocking Event Loop in Model Workers (Incomplete Fix for ff66426) CVE-2026-6607Medium5.3no fix yet | Medium5.3 | No fix yet |
| Apr 20 | FastChat has a Content Moderation Bypass via Arena Side-by-Side Views CVE-2026-6608Medium5.3no fix yet | Medium5.3 | No fix yet |