CVE-2026-34148

Name: CVE-2026-34148
Creator: NVD / NIST
Published: 2026-04-06T16:16:34.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2026-34148 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.55%

41.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Fedify	Fedify\/Fedify	< 1.9.6
Fedify	Fedify\/Fedify	>= 1.10.0, < 1.10.5
Fedify	Fedify\/Fedify	>= 2.0.0, < 2.0.8
Fedify	Fedify\/Fedify	>= 2.1.0, < 2.1.1
Fedify	Fedify\/Vocab-Runtime	< 2.0.8
Fedify	Fedify\/Vocab-Runtime	>= 2.1.0, < 2.1.1

References

https://github.com/fedify-dev/fedify/releases/tag/1.10.5Release Notes
https://github.com/fedify-dev/fedify/releases/tag/1.9.6Release Notes
https://github.com/fedify-dev/fedify/releases/tag/2.0.8Release Notes
https://github.com/fedify-dev/fedify/releases/tag/2.1.1Release Notes
https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgpExploit, Vendor Advisory
https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgpExploit, Vendor Advisory

Timeline

Published: Apr 6, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34148?

How severe is CVE-2026-34148?

CVE-2026-34148 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34148?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34148?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST