fedify vocab-runtime up to 1.9.5/1.10.4/2.0.7/2.1.0 Outbound Request resource consumption

Summaryinfo

A vulnerability categorized as problematic has been discovered in fedify vocab-runtime up to 1.9.5/1.10.4/2.0.7/2.1.0. This issue affects some unknown processing of the component Outbound Request Handler. The manipulation results in resource consumption. This vulnerability is cataloged as CVE-2026-34148. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in fedify vocab-runtime up to 1.9.5/1.10.4/2.0.7/2.1.0. It has been classified as problematic. Affected is an unknown functionality of the component Outbound Request Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-34148 since 03/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 1.9.6, 1.10.5, 2.0.8 or 2.1.1 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• fedify

Name

• vocab-runtime

Version

• 1.9.0
• 1.9.1
• 1.9.2
• 1.9.3
• 1.9.4
• 1.9.5
• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3
• 1.10.4
• 2.0
• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7
• 2.1.0

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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