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

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Summary

CVECVE-2026-34148
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-06 16:16:34 UTC
Updated2026-04-07 15:17:39 UTC
DescriptionFedify 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000400000 probability, percentile 0.120150000 (date 2026-04-07)

Problem Types: CWE-400 | CWE-770 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA @fedify Fedify affected < 1.9.6 Not specified
CNA @fedify Fedify affected >= 1.10.0, < 1.10.5 Not specified
CNA @fedify Fedify affected >= 2.0.0, < 2.0.8 Not specified
CNA @fedify Fedify affected >= 2.1.0, < 2.1.1 Not specified
CNA @fedify Vocab-runtime affected < 2.0.8 Not specified
CNA @fedify Vocab-runtime affected >= 2.1.0, < 2.1.1 Not specified

References

ReferenceSourceLinkTags
github.com/fedify-dev/fedify/releases/tag/2.1.1 [email protected] github.com
github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/fedify-dev/fedify/releases/tag/2.0.8 [email protected] github.com
github.com/fedify-dev/fedify/releases/tag/1.10.5 [email protected] github.com
github.com/fedify-dev/fedify/releases/tag/1.9.6 [email protected] github.com
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