Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and 2.1.1, @fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service. This vulnerability is fixed in 1.9.6, 1.10.5, 2.0.8, and 2.1.1.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp Exploit, Vendor Advisory
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · fedifyNVD modified 2026-10-26 22:10
Affected (CPE criteria) 2
cpe:2.3:a:fedify:fedify\/fedify:*:*:*:*:*:node.js:*:*cpe:2.3:a:fedify:fedify\/vocab-runtime:*:*:*:*:*:node.js:*:*
References 6
- https://github.com/fedify-dev/fedify/releases/tag/1.10.5 Release Notes
- https://github.com/fedify-dev/fedify/releases/tag/1.9.6 Release Notes
- https://github.com/fedify-dev/fedify/releases/tag/2.0.8 Release Notes
- https://github.com/fedify-dev/fedify/releases/tag/2.1.1 Release Notes
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp Exploit, Vendor Advisory
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp Exploit, Vendor Advisory