Resource exhaustion in @Fedify Fedify
CVE-2026-34148
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.006 (42.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- @Fedify Fedify — versions < 1.9.6, >= 1.10.0, < 1.10.5, >= 2.0.0, < 2.0.8
- @Fedify Vocab-runtime — versions < 2.0.8, >= 2.1.0, < 2.1.1
- Fedify Fedify\/fedify
- Fedify Fedify\/vocab-runtime
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-34148?
- CVE-2026-34148 is a high-severity vulnerability in @Fedify Fedify, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-04-06.
- How severe is CVE-2026-34148?
- High severity. CVSS v3 base score is 7.5 out of 10.