Is fschat affected by CVE-2026-6607?

PyPI fschat is affected in <=0.2.26.

Is CVE-2026-6607 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.6%.

medium

CVE-2026-6607

Q: Is CVE-2026-6607 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.6%.

PyPI · fschat

Summary

FastChat has Denial of Service Through Blocking Event Loop in Model Workers (Incomplete Fix for ff66426)

Severity: medium
EPSS: 0.6% (p45)
Also known as: GHSA-5h65-jx66-j7p5
Published: 2026-04-20

References

https://nvd.nist.gov/vuln/detail/CVE-2026-6607
https://github.com/lm-sys/FastChat/issues/3833
https://github.com/lm-sys/FastChat/pull/3835

Related advisories

CVE-2024-12376 — high · PyPI/fschat
CVE-2024-11603 — high · PyPI/fschat
CVE-2024-10907 — high · PyPI/fschat
CVE-2024-10912 — high · PyPI/fschat
CVE-2026-6608 — medium · PyPI/fschat
CVE-2024-10908 — medium · PyPI/fschat

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.