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Product · lm-sys

fastchat

4 known vulnerabilities.

fastchat at a glance

Last 12 months
3
Critical · all time
1
Exploited · all time
0
Public exploit · all time
0
New vulnerabilities per month · last 12 months
0 1 2 December 2025: 0 vulnerabilities Dec 2025 January 2026: 0 vulnerabilities February 2026: 0 vulnerabilities March 2026: 0 vulnerabilities Mar April 2026: 2 vulnerabilities May 2026: 0 vulnerabilities June 2026: 0 vulnerabilities Jun July 2026: 0 vulnerabilities August 2026: 0 vulnerabilities September 2026: 1 vulnerability, 1 critical Sep October 2026: 0 vulnerabilities November 2026: 0 vulnerabilities
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All Critical High Medium Low Exploited only Public exploit

4 results · Feed

  • Critical 9.4
    CVE-2026-85695

    FastChat Unauthenticated Worker Registration SSRF and Model Spoofing

    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 vict…

    lm-sys fastchat
  • Medium 5.3
    CVE-2026-6608

    lm-sys fastchat Arena Side-by-Side View add_text control flow

    A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now publi…

    lm-sys fastchat fschat PyPI
  • Medium 5.3
    CVE-2026-6607

    lm-sys fastchat Worker API Endpoint api_generate resource consumption

    A security vulnerability has been detected in lm-sys fastchat up to 0.2.36. This issue affects the function api_generate of the component Worker API Endpoint. The manipulation leads to resource consumption. The attack can be initiated remotely. The exploit ha…

    lm-sys fastchat fschat PyPI
  • Medium 5.3
    CVE-2025-3677

    lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization

    A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has t…

    lm-sys fastchat