FastChat vulnerabilities

6 known vulnerabilities in FastChat from Lm-sys. 6 are rated high or critical. Each entry lists the affected versions and the release that fixes it, where the vendor has published one.

Latest first

• 9.4 Critical severity

  FastChat: Missing Authentication for Critical Functionality

  CVE-2026-85695Sep 4, 2026Lm-sys

  FastChat contains an authentication bypass vulnerability in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victi

• 7.5 High severity

  lm-sys/fastchat: Server-Side Request Forgery

  CVE-2024-12376Mar 20, 2025Lm-sys

  A Server-Side Request Forgery (SSRF) vulnerability was identified in the lm-sys/fastchat web server, specifically in the affected version git 2c68a13. This vulnerability allows an attacker to access internal server resources and data that are otherwise inacces

• 7.5 High severity

  lm-sys/fastchat: Server-Side Request Forgery

  CVE-2024-11603Mar 20, 2025Lm-sys

  A Server-Side Request Forgery (SSRF) vulnerability exists in lm-sys/fastchat version 0.2.36. The vulnerability is present in the `/queue/join?` endpoint, where insufficient validation of the path parameter allows an attacker to send crafted requests. This can

• 7.5 High severity

  lm-sys/fastchat: Uncontrolled Resource Consumption

  CVE-2024-10912Mar 20, 2025Lm-sys

  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

• 7.5 High severity

  lm-sys/fastchat: Loop with Unreachable Exit Condition

  CVE-2024-10907Mar 20, 2025Lm-sys

  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

• 9.3 Critical severity

  lm-sys/fastchat: Server-Side Request Forgery

  CVE-2024-10044Dec 30, 2024Lm-sys

  A Server-Side Request Forgery (SSRF) vulnerability exists in the POST /worker_generate_stream API endpoint of the Controller API Server in lm-sys/fastchat, as of commit e208d5677c6837d590b81cb03847c0b9de100765. This vulnerability allows attackers to exploit th