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High · 7.8 CVE-2025-54365 EUVD-2025-22476GHSA-rrf6-pxg8-684gPYSEC-2026-1360

fastapi-guard patch contains bypassable RegEx

Published Jul 23, 2025 · Updated Jul 24, 2025 · Assigned by GitHub_M

Description

fastapi-guard is a security library for FastAPI that provides middleware to control IPs, log requests, detect penetration attempts and more. In version 3.0.1, the regular expression patched to mitigate the ReDoS vulnerability by limiting the length of string fails to catch inputs that exceed this limit. This type of patch fails to detect cases in which the string representing the attributes of a <script> tag exceeds 100 characters. As a result, most of the regex patterns present in version 3.0.1 can be bypassed. This is fixed in version 3.0.2.

Affected products

VendorProductAffectedFixed
rennf93 fastapi-guard >= 3.0.1, < 3.0.2 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI fastapi-guard >= 3.0.1, < 3.0.2 3.0.2 GHSA-rrf6-pxg8-684g

References