CVE-2026-34148: CWE-400: Uncontrolled Resource Consumption in @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.
AI Analysis
Technical Summary
The @fedify/fedify library versions before 1.9.6, 1.10.5, 2.0.8, and 2.1.1 have a vulnerability where their HTTP redirect handling in remote document loaders is uncontrolled. Specifically, the library follows HTTP redirects recursively without enforcing a maximum redirect count or detecting redirect loops. An attacker who controls a remote ActivityPub key or actor URL can exploit this behavior to force the server to make excessive outbound HTTP requests from a single inbound request, leading to uncontrolled resource consumption and denial of service. The issue is classified under CWE-400 (Uncontrolled Resource Consumption) and CWE-770 (Allocation of Resources Without Limits or Throttling). The vulnerability is fixed in the specified patched versions.
Potential Impact
Exploitation of this vulnerability can cause a denial of service on servers using vulnerable versions of the @fedify/fedify library by forcing them to perform excessive outbound HTTP requests. This results in resource exhaustion, potentially degrading or interrupting service availability. There is no impact on confidentiality or integrity according to the CVSS vector, only availability is affected.
Mitigation Recommendations
Fixed versions 1.9.6, 1.10.5, 2.0.8, and 2.1.1 of the @fedify/fedify library address this vulnerability by enforcing limits on HTTP redirect handling. Users should upgrade to one of these versions or later to remediate the issue. Patch status is confirmed by the vendor's versioning information. No alternative mitigations or temporary fixes are indicated.
CVE-2026-34148: CWE-400: Uncontrolled Resource Consumption in @fedify fedify
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The @fedify/fedify library versions before 1.9.6, 1.10.5, 2.0.8, and 2.1.1 have a vulnerability where their HTTP redirect handling in remote document loaders is uncontrolled. Specifically, the library follows HTTP redirects recursively without enforcing a maximum redirect count or detecting redirect loops. An attacker who controls a remote ActivityPub key or actor URL can exploit this behavior to force the server to make excessive outbound HTTP requests from a single inbound request, leading to uncontrolled resource consumption and denial of service. The issue is classified under CWE-400 (Uncontrolled Resource Consumption) and CWE-770 (Allocation of Resources Without Limits or Throttling). The vulnerability is fixed in the specified patched versions.
Potential Impact
Exploitation of this vulnerability can cause a denial of service on servers using vulnerable versions of the @fedify/fedify library by forcing them to perform excessive outbound HTTP requests. This results in resource exhaustion, potentially degrading or interrupting service availability. There is no impact on confidentiality or integrity according to the CVSS vector, only availability is affected.
Mitigation Recommendations
Fixed versions 1.9.6, 1.10.5, 2.0.8, and 2.1.1 of the @fedify/fedify library address this vulnerability by enforcing limits on HTTP redirect handling. Users should upgrade to one of these versions or later to remediate the issue. Patch status is confirmed by the vendor's versioning information. No alternative mitigations or temporary fixes are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-25T20:12:04.195Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d3d1a00a160ebd92c130d0
Added to database: 4/6/2026, 3:30:40 PM
Last enriched: 4/6/2026, 3:45:49 PM
Last updated: 4/7/2026, 5:42:03 AM
Views: 4
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