Resource exhaustion in @Fedify Fedify

CVE-2026-34148

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.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.006 (42.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-34148?
CVE-2026-34148 is a high-severity vulnerability in @Fedify Fedify, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-04-06.
How severe is CVE-2026-34148?
High severity. CVSS v3 base score is 7.5 out of 10.