Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/fedify-dev/fedify/releases/tag/2.2.3
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
FAQ
What is CVE-2026-42462?
CVE-2026-42462 is a vulnerability with a CVSS score of 7.0 (HIGH). 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 ...
How severe is CVE-2026-42462?
CVE-2026-42462 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42462?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.