CVE-2025-54365

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...

Regular Expression Denial of Service (ReDoS)

Overview fastapi-guard is a Security library for FastAPI to control IPs and more. Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS via the SusPatternsManager class in the suspatternshandler.py file. An attacker can cause excessive resource consumption...

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

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...

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

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...

CVE-2025-54365

CVE-2025-54365 concerns the Python package fastapi-guard (3.0.1) where a patched regular-expression length limit fails to catch inputs that bypasses the regex filtering (notably for [removed] attributes), enabling potential ReDoS/back-end resource strain and degraded availability. Multiple connec...

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

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...

GHSA-RRF6-PXG8-684G FastAPI Guard has a regex bypass

Summary The regular expression patched to mitigate the ReDoS vulnerability by limiting the length of string fails to catch inputs that exceed this limit. Details In version 3.0.1, you can find a commit like the one in the link below, which was made to prevent ReDoS...

FastAPI Guard has a regex bypass

Summary The regular expression patched to mitigate the ReDoS vulnerability by limiting the length of string fails to catch inputs that exceed this limit. Details In version 3.0.1, you can find a commit like the one in the link below, which was made to prevent ReDoS...

Fastapi-guard security vulnerabilities

fastapi-guard is a security library for FastAPI by Renzo F Individual Developer that provides middleware to control IPs, log requests and detect penetration attempts. A security vulnerability exists in fastapi-guard version 3.0.1, which stems from an improperly restricted regular expression lengt...

PT-2025-30607

Name of the Vulnerable Software and Affected Versions fastapi-guard versions 3.0.1 Description The regular expression patch intended to mitigate a ReDoS vulnerability failed to adequately limit input string length. Specifically, the patch did not account for cases where the attributes within a ta...

CVE-2025-54365: Improper Input Validation

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...

CVE-2025-53528

Cadwyn creates production-ready community-driven modern Stripe-like API versioning in FastAPI. In versions before 5.4.3, the version parameter of the "/docs" endpoint is vulnerable to a Reflected XSS Cross-Site Scripting attack. This XSS would notably allow an attacker to execute JavaScript code ...

PYSEC-2025-71

Cadwyn creates production-ready community-driven modern Stripe-like API versioning in FastAPI. In versions before 5.4.3, the version parameter of the "/docs" endpoint is vulnerable to a Reflected XSS Cross-Site Scripting attack. This XSS would notably allow an attacker to execute JavaScript code ...

CVE-2025-53528 Cadwyn is vulnerable to an XSS attack through its docs page

Cadwyn creates production-ready community-driven modern Stripe-like API versioning in FastAPI. In versions before 5.4.3, the version parameter of the "/docs" endpoint is vulnerable to a Reflected XSS Cross-Site Scripting attack. This XSS would notably allow an attacker to execute JavaScript code ...

CVE-2025-53528

Cadwyn (FastAPI-based API versioning tool) is affected by CVE-2025-53528 due to a Reflected XSS vulnerability in the version parameter of the /docs endpoint. The issue allows an attacker to execute JavaScript in a user’s session via a crafted link. The vulnerability is fixed in version 5.4.3; rem...

CVE-2025-53528: Improper Neutralization of Input During Web Page Generation

Cadwyn creates production-ready community-driven modern Stripe-like API versioning in FastAPI. In versions before 5.4.3, the version parameter of the "/docs" endpoint is vulnerable to a Reflected XSS Cross-Site Scripting attack. This XSS would notably allow an attacker to execute JavaScript code ...

CVE-2025-53539

FastAPI Guard is a security library for FastAPI that provides middleware to control IPs, log requests, and detect penetration attempts. fastapi-guard's penetration attempts detection uses regex to scan incoming requests. However, some of the regex patterns used in detection are extremely...

fastapi-guard Regular Expression DoS

The vulnerability of the fastapi-guard tool for analyzing network traffic, detecting network issues, and responding to them is related to the use of a regular expression with inefficient computational complexity. Exploiting this vulnerability could allow an attacker operating remotely to cause...

Regular Expression Denial Of Service (ReDoS)

fastapi-guard is vulnerable to Regular Expression Denial Of Service ReDoS. The vulnerability is due to inefficient regex pattern matching due to use of poorly optimized regular expressions that cause polynomial-time backtracking on crafted inputs, leading to high CPU usage and service...

GHSA-J47Q-RC62-W448 fastapi-guard is vulnerable to ReDoS through inefficient regex

Summary fastapi-guard detects penetration attempts by using regex patterns to scan incoming requests. However, some of the regex patterns used in detection are extremely inefficient and can cause polynomial complexity backtracks when handling specially crafted inputs. It is not as severe as...