{"id":"CVE-2026-62857","title":"Fedify is a TypeScript library for building federated server apps powered by ActivityPub","summary":"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[].h…","severity":"none","cwe":["CWE-918"],"published":"2026-08-06","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62857","references":[{"url":"https://github.com/fedify-dev/fedify/releases/tag/2.3.2","label":"security-advisories@github.com"},{"url":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-hqph-j65v-8cq5","label":"security-advisories@github.com"},{"url":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-hqph-j65v-8cq5","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00315,"epssPercentile":0.24608,"ingestedAt":"2026-08-09T00:31:25.056Z","slug":"CVE-2026-62857","body":"## Overview\n\nFedify 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}