{"cve":"CVE-2026-6607","nvd":{"published":"2026-04-20T05:16:16.190","modified":"2026-10-26T22:10:00.163","status":"Deferred","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","score":5.5},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-400","CWE-404"],"references":["https://gist.github.com/YLChen-007/87216a2d97a882d619e11dc67cd473b5","https://github.com/lm-sys/FastChat/","https://github.com/lm-sys/FastChat/commit/c9e84b89c91d45191dc24466888de526fa04cf33","https://github.com/lm-sys/FastChat/issues/3833","https://github.com/lm-sys/FastChat/pull/3835"],"products":[],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-6607","score":0.00623,"percentile":0.49579,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-5h65-jx66-j7p5","url":"https://osv.dev/vulnerability/GHSA-5h65-jx66-j7p5","summary":"FastChat has Denial of Service Through Blocking Event Loop in Model Workers (Incomplete Fix for ff66426)","modified":"2026-07-13T16:42:38.205840525Z","packages":[{"ecosystem":"PyPI","name":"fschat","purl":"pkg:pypi/fschat","ranges":["<=0.2.26"],"fixed":[]}]},{"id":"PYSEC-2026-2484","url":"https://osv.dev/vulnerability/PYSEC-2026-2484","summary":"FastChat has Denial of Service Through Blocking Event Loop in Model Workers (Incomplete Fix for ff66426)","modified":"2026-07-13T16:32:37.398852409Z","packages":[{"ecosystem":"PyPI","name":"fschat","purl":"pkg:pypi/fschat","ranges":["<=0.2.26"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}