PT-2025-19983 · Unknown · Fastapi Guard

Amooryx · Published 2025-05-06 · Updated 2025-12-31 · CVE-2025-46814

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions FastAPI Guard versions prior to 2.0.0

Description An HTTP header injection issue has been identified in FastAPI Guard. By manipulating the X-Forwarded-For header, an attacker can potentially inject arbitrary IP addresses into the request. This can allow attackers to bypass IP-based access controls, mislead logging systems, and impersonate trusted clients. It is especially impactful when the application relies on the X-Forwarded-For header for IP-based authorization or authentication.

Recommendations For versions prior to 2.0.0, upgrade to FastAPI Guard version 2.0.0 to receive a fix. As a temporary workaround, consider restricting the use of the X-Forwarded-For header until a patch is available.

Exploit

Fix

Special Elements Injection

Weakness Enumeration

CWE-74

Related Identifiers

CVE-2025-46814

GHSA-77Q8-QMJ7-X7PP

Affected Products

Fastapi Guard

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/46xxx/CVE-2025-46814.json · Exploit
• https://github.com/rennf93/fastapi-guard/security/advisories/GHSA-77q8-qmj7-x7pp · Vendor Advisory
• https://github.com/rennf93/fastapi-guard/commit/0b003fda4c678c1b514e95f319aee88113e9bf4b · Patch
• https://osv.dev/vulnerability/CVE-2025-46814 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-46814 · Security Note
• https://twitter.com/CVEnew/status/1919774072486973613 · Twitter Post
• https://t.me/cvedetector/24614 · Telegram Post
• https://t.me/cveNotify/147347 · Telegram Post