CVE-2026-34148
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.55%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.55% probability · 44th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-770
- Affected
- fedify/fedify\/fedify · fedify/fedify\/vocab-runtime
- Source
- security-advisories@github.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.