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CVE-2026-34148

Fedify Fedify/fedify denial of service

7.5 HIGHPublic exploitEPSS 0.66%
  1. Published6 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Fedify Fedify/fedify≥ 1.10.0 < 1.10.5 · ≥ 2.0.0 < 2.0.8 · ≥ 2.1.0 < 2.1.1 · < 1.9.6
Fedify Fedify/vocab-runtime≥ 2.1.0 < 2.1.1 · < 2.0.8

Remediation

Fixed in
Fedify Fedify/fedify≥ 1.10.5
Fedify Fedify/vocab-runtime≥ 2.1.1

References

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Frequently asked

Is CVE-2026-34148 being actively exploited?

CVE-2026-34148 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.66%.

How severe is CVE-2026-34148?

CVE-2026-34148 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.66% probability of exploitation.

Which products are affected by CVE-2026-34148?

Affected products include Fedify Fedify/fedify, Fedify Fedify/vocab-runtime.

How do I fix CVE-2026-34148?

Upgrade affected software to a fixed version, for example Fedify Fedify/fedify 1.10.5, Fedify Fedify/vocab-runtime 2.1.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34148 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.