{"cve":"CVE-2026-42462","nvd":{"published":"2026-06-10T22:16:57.387","modified":"2026-07-23T09:10:00.113","status":"Deferred","description":"Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","score":7.0},"cwes":["CWE-180","CWE-347","CWE-436","CWE-1289"],"references":["https://github.com/fedify-dev/fedify/releases/tag/2.2.3","https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:38:48.522727527+00:00"},"epss":{"cve":"CVE-2026-42462","score":0.00171,"percentile":0.06437,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9rfg-v8g9-9367","url":"https://osv.dev/vulnerability/GHSA-9rfg-v8g9-9367","summary":"Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring","modified":"2026-09-10T03:50:46.561534947Z","packages":[{"ecosystem":"npm","name":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","ranges":[">=2.2.0 <2.2.3"],"fixed":["2.2.3"]},{"ecosystem":"npm","name":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","ranges":[">=2.1.0 <2.1.14"],"fixed":["2.1.14"]},{"ecosystem":"npm","name":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","ranges":[">=2.0.0 <2.0.18"],"fixed":["2.0.18"]},{"ecosystem":"npm","name":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","ranges":[">=1.10.0 <1.10.10"],"fixed":["1.10.10"]},{"ecosystem":"npm","name":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","ranges":["<1.9.11"],"fixed":["1.9.11"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}