High severityNVD Advisory· Published Jul 23, 2025· Updated Jul 24, 2025
fastapi-guard patch contains bypassable RegEx
CVE-2025-54365
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 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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
fastapi-guardPyPI | >= 3.0.1, < 3.0.2 | 3.0.2 |
Affected products
2- Range: >= 3.0.1, < 3.0.2
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-rrf6-pxg8-684gghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-54365ghsaADVISORY
- github.com/rennf93/fastapi-guard/commit/0829292c322d33dc14ab00c5451c5c138148035aghsax_refsource_MISCWEB
- github.com/rennf93/fastapi-guard/commit/d9d50e8130b7b434cdc1b001b8cfd03a06729f7fghsax_refsource_MISCWEB
- github.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684gghsax_refsource_CONFIRMWEB
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