GHSA-rrf6-pxg8-684g: fastapi-guard (CVE-2025-54365)

Package	Ecosystem	Affected	Fixed in
fastapi-guard	PyPI	>=3.0.1, <3.0.2	3.0.2

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

FastAPI Guard versions 3.0.1 up to but not including 3.0.2 are affected. The length limits added to the regular expressions meant to block ReDoS fail to stop inputs longer than those limits, so many of its detection patterns can be bypassed, potentially allowing XSS and SQL injection. Upgrade to fastapi-guard 3.0.2.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.8	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:P	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0087, the 58th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:34 UTC First seen by agentprime
31 Oct 2026, 14:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.