rennf93 fastapi-guard up to 3.0.1 redos

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in rennf93 fastapi-guard up to 3.0.1. It has been declared as problematic. This affects an unknown part. The manipulation results in redos. This vulnerability is cataloged as CVE-2025-54365. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in rennf93 fastapi-guard up to 3.0.1. Affected is some unknown processing. The manipulation with an unknown input leads to a redos vulnerability. CWE is classifying the issue as CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-54365 since 07/21/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1449.003.

Upgrading to version 3.0.2 eliminates this vulnerability. Applying the patch 0829292c322d33dc14ab00c5451c5c138148035a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-22476). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Redos
CWE: CWE-1333 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: fastapi-guard 3.0.2
Patch: 0829292c322d33dc14ab00c5451c5c138148035a

Timelineinfo

07/21/2025 CVE reserved
07/24/2025 +3 days Advisory disclosed
07/24/2025 +0 days VulDB entry created
10/09/2025 +77 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-rrf6-pxg8-684g
Status: Confirmed

CVE: CVE-2025-54365 (🔒)
GCVE (CVE): GCVE-0-2025-54365
GCVE (VulDB): GCVE-100-317484
EUVD: 🔒

Entryinfo

Created: 07/24/2025 09:16
Updated: 10/09/2025 18:00
Changes: 07/24/2025 09:16 (69), 07/24/2025 17:20 (1), 10/09/2025 18:00 (13)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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