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Vulnerability record · CVE-2026-34148 · published 6 April 2026

CVE-2026-34148: Fedify\/fedify uncontrolled resource consumption vulnerability

Fedify · Fedify\/Fedify

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.

7.5 CVSS 3.1 High EPSS 0.66% · top 50.2% CWE-400 · Uncontrolled resource consumptionCWE-770 · Allocation without limits
7.5CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 ExploitVendor Advisory
https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-34148), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.