Description
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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| @fedify | fedify | < 1.9.6; >= 1.10.0, < 1.10.5; >= 2.0.0, < 2.0.8; >= 2.1.0, < 2.1.1 |
| @fedify | vocab-runtime | < 2.0.8; >= 2.1.0, < 2.1.1 |
References
- https://github.com/fedify-dev/fedify/releases/tag/1.10.5Release Notes
- https://github.com/fedify-dev/fedify/releases/tag/1.9.6Release Notes
- https://github.com/fedify-dev/fedify/releases/tag/2.0.8Release Notes
- https://github.com/fedify-dev/fedify/releases/tag/2.1.1Release Notes
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgpExploit, Vendor Advisory
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgpExploit, Vendor Advisory
Timeline
- Published
- Apr 6, 2026
- Last modified
- Oct 26, 2026
- NVD status
- Analyzed