CVE-2025-23221

Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards. This vulnerability allows a user to maneuver the Webfinger mechanism to perform a GET request to any internal resource on any Host, Port, URL combination regardless of present security...

EUVD-2025-0153

Malicious code in bioql PyPI...

Server-Side Request Forgery (SSRF)

Fedify is vulnerable to Server-Side Request Forgery SSRF. The vulnerability is due to improper validation of the Webfinger mechanism, allowing attackers to perform GET requests to internal resources, cause denial of service via infinite loops, or execute blind SSRF attacks...

CVE-2025-23221

Summary: CVE-2025-23221 affects Fedify’s Webfinger handling, enabling an attacker to abuse lookupWebFinger to trigger an endless redirect loop and potential Blind SSRF, leading to Denial of Service. Multiple sources (Red Hat, NVD/NVD-like entries, OSV, GHSA advisories, Veracode) describe the issu...