Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fedify | Fedify\/Fedify | < 1.9.6 |
| Fedify | Fedify\/Vocab-Runtime | < 2.0.8 |
Related Weaknesses (CWE)
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-hwgpExploitVendor Advisory
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgpExploitVendor Advisory
FAQ
What is CVE-2026-34148?
CVE-2026-34148 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 docu...
How severe is CVE-2026-34148?
CVE-2026-34148 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34148?
Check the references section above for vendor advisories and patch information. Affected products include: Fedify Fedify\/Fedify, Fedify Fedify\/Vocab-Runtime.