CVE-2026-42462 HIGH

CVE-2026-42462: Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

Vendor Fedify-Dev
Product fedify
Weakness CWE-180
Published June 10, 2026
Last update June 11, 2026
View on NVD All CVEs

CVSS base score

7.0/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality Low
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 10, 2026 CVE published
June 11, 2026 Record updated