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CVE-2025-54365

CVE-2025-54365 · fastapi-guard patch contains bypassable RegEx

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.8 · High · EPSS 0.9% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • fastapi-guard

    Versions
    • >= 3.0.1, < 3.0.2: Affected

    No fix published

  • fastapi-guard PyPI

    Versions
    • 3.0.1
    Affected ranges
    • ECOSYSTEM: ≥ 3.0.1, < 3.0.2

    Update to 3.0.2

Original sources

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