CVE-2026-42462
Published:June 10, 2026
Updated:June 11, 2026
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.
Affected Packages
https://github.com/fedify-dev/fedify.git (GITHUB):
Affected version(s) >=0.1.0 <2.2.3Fix Suggestion:
Update to version 2.2.3@fedify/fedify (NPM):
Affected version(s) >=2.0.0 <2.0.18Fix Suggestion:
Update to version 2.0.18@fedify/fedify (NPM):
Affected version(s) >=1.10.0 <1.10.10Fix Suggestion:
Update to version 1.10.10@fedify/fedify (NPM):
Affected version(s) >=2.1.0 <2.1.14Fix Suggestion:
Update to version 2.1.14@fedify/fedify (NPM):
Affected version(s) >=2.2.0 <2.2.3Fix Suggestion:
Update to version 2.2.3@fedify/fedify (NPM):
Affected version(s) >=0.5.0 <1.9.11Fix Suggestion:
Update to version 1.9.11Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
EPSS
Base Score:
0.04