CVE-2026-42462

HighCVSS 7.0/10Last modified Jul 23, 2026

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.

Metrics

CVSS 3.1 7.0/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

Weakness enumeration

CWE-180 CWE-347 CWE-436 CWE-1289

Affected software

Vendor	Product	Versions
fedify-dev	fedify	>= 2.2.0, < 2.2.3; >= 2.1.0, < 2.1.14; >= 2.0.0, < 2.0.18; >= 1.10.0, < 1.10.10; < 1.9.11

References

Timeline

Published: Jun 10, 2026
Last modified: Jul 23, 2026
NVD status: Deferred

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