CVE-2024-10907

Denial of Service (DoS) via Multipart Boundary in lm-sys/fastchat

Published Mar 20, 2025 CVSS 3.0 · 7.5 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-7049 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.
Github GHSA Github GHSA GHSA-qg86-f892-m4hj FastChat Uncontrolled Resource Consumption vulnerability
History
Type Values Removed Values Added
Weaknesses CWE-400
Type Values Removed Values Added
Weaknesses CWE-835
Type Values Removed Values Added
First Time appeared Lm-sys
Lm-sys fastchat
CPEs cpe:2.3:a:lm-sys:fastchat:0.2.36:*:*:*:*:*:*:*
Vendors & Products Lm-sys
Lm-sys fastchat
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Denial of Service (DoS) via Multipart Boundary in lm-sys/fastchat
Weaknesses CWE-400
References
Metrics cvssV3_0

{'score': 7.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
@huntr_ai
Published
Updated
Oct 15, 2025, 12:50 PM
Reserved
Nov 5, 2024, 10:25 PM
Status
Modified
Published
Mar 20, 2025, 10:15 AM
Modified
Jun 17, 2026, 6:56 AM