CVE-2026-6607
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk50th percentile - higher than 50% of all known CVEs
Summary
In lm-sys fastchat up to 0.2.36, the api_generate function in the Worker API Endpoint allows remote resource consumption. The exploit is publicly disclosed, and a patch (commit ff66426) missed other entry points.
Risk Assessment
An attacker can remotely exhaust system resources, causing denial of service or increased operational costs.
Recommendation
Apply the available patch (commit c9e84b89c91d45191dc24466888de526fa04cf33) and consider restricting API access.
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Original NVD description (English source)
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 has been disclosed publicly and may be used. The identifier of the patch is c9e84b89c91d45191dc24466888de526fa04cf33. It is suggested to install a patch to address this issue. Commit ff66426 patched this issue in api_generate of base_model_worker.py and did miss other entry points.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

