CVE-2026-42462
High
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.
SeverityHigh
CVSS7.0
Exploit probability—
Product@fedify/fedify
PublishedJun 10, 2026
First seenJun 10, 2026
How to fix
Update
- @fedify/fedify2.2.3, 2.1.14, 2.0.18, 1.10.10, 1.9.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @fedify/fedifynpm | 2.2.0 ≤ v < 2.2.3, 2.1.0 ≤ v < 2.1.14, 2.0.0 ≤ v < 2.0.18, 1.10.0 ≤ v < 1.10.10, v < 1.9.11 | 2.2.3, 2.1.14, 2.0.18, 1.10.10, 1.9.11 |
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