CyberSecBulletin
CVE-2026-34148NVD status: Analyzed

fedify: Uncontrolled Resource Consumption

Published Updated By the CyberSecBulletin desk

CVE-2026-34148 is a high-severity uncontrolled resource consumption vulnerability in fedify, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected fedify versions: < 1.9.6; >= 1.10.0, < 1.10.5; >= 2.0.0, < 2.0.8, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.57% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Fedify/fedify to 1.9.6 or 1.10.5 or 2.0.8 or 2.1.1, whichever matches your release line, or a later version.
  2. Update Fedify/vocab-runtime to 2.0.8 or 2.1.1, whichever matches your release line, or a later version.
  3. Read the advisory on github.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
@fedifyfedify< 1.9.6; >= 1.10.0, < 1.10.5; >= 2.0.0, < 2.0.8; >= 2.1.0, < 2.1.1Not stated
@fedifyvocab-runtime< 2.0.8; >= 2.1.0, < 2.1.1Not stated
FedifyFedify/fedifybefore 1.9.6; 1.10.0 up to, but not including, 1.10.5; 2.0.0 up to, but not including, 2.0.8; 2.1.0 up to, but not including, 2.1.11.9.6, 1.10.5, 2.0.8, 2.1.1
FedifyFedify/vocab-runtimebefore 2.0.8; 2.1.0 up to, but not including, 2.1.12.0.8, 2.1.1

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (github.com).

Official 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource.

How developers prevent this class of flaw

  • Ensure that protocols have specific limits of scale placed on them.
  • Ensure that all failures in resource allocation place the system into a safe posture.

More Uncontrolled Resource Consumption vulnerabilities (CWE-400)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Uncontrolled Resource Consumption vulnerabilities

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