CVE-2026-34148

Fedify affected by resource exhaustion caused by unbounded redirect following during remote key/document resolution

State: Published
Severity: 7.5 High
Published: Apr 6, 2026
Updated: Apr 7, 2026
Reserved: Mar 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
fedify@fedify	< 1.9.6Affected >= 1.10.0, < 1.10.5Affected >= 2.0.0, < 2.0.8Affected >= 2.1.0, < 2.1.1Affected
vocab-runtime@fedify	< 2.0.8Affected >= 2.1.0, < 2.1.1Affected

References

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