CVE-2026-62857: Fedify-Dev Fedify

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. From version 1.2.0 through the affected 1.9, 1.10, 2.0, 2.1, 2.2, and 2.3 maintenance lines, getNodeInfo() follows an attacker-controlled links[].href value from /.well-known/nodeinfo without scheme, redirect, or private-address validation, allowing requests to loopback, link-local, cloud metadata, and private-network services and returning their response bodies. This issue is fixed in versions 1.9.13, 1.10.12, 2.0.22, 2.1.18, 2.2.7, and 2.3.2.

Affected products

• Fedify-Dev Fedify: from 1.2.0, before 1.9.13 (fixed in 1.9.13); from 1.10.0, before 1.10.12 (fixed in 1.10.12); from 2.0.0, before 2.0.22 (fixed in 2.0.22); from 2.1.0, before 2.1.18 (fixed in 2.1.18); from 2.2.0, before 2.2.7 (fixed in 2.2.7); from 2.3.0, before 2.3.2 (fixed in 2.3.2)

Published 2026-08-06. Last modified 2026-09-18.