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CVE-2025-54365

7.5 · HIGH

fastapi-guard is a security library for FastAPI that provides middleware to control IPs, log requests, detect penetration attempts and more.

Published Jul 23, 2025CWE-20EPSS 0.81%

Overview

CVE-2025-54365 is a high-severity vulnerability. It was published on July 23, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/rennf93/fastapi-guard/commit/0829292c322d33dc14ab00c5451c5c138148035aGitHubgithub.com/rennf93/fastapi-guard/commit/d9d50e8130b7b434cdc1b001b8cfd03a06729f7fGitHubgithub.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684gGitHubgithub.com/rennf93/fastapi-guard/security/advisories/GHSA-rrf6-pxg8-684g

How CyberStrike helps

Frequently asked questions

What is CVE-2025-54365?

CVE-2025-54365 is a high-severity vulnerability. It was published on July 23, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-54365?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-54365?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-54365?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-54365 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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