CVE-2026-42462
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.
Scoring
- Severity
- HIGH
- CVSS base score
- 7
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
- EPSS probability
- 0.17%
- CWE
- CWE-180, CWE-347, CWE-436, CWE-1289
- Published
- 2026-06-10
- Last modified
- 2026-06-11
Affected products
- fedify-dev fedify
- fedify-dev fedify
- fedify-dev fedify
- fedify-dev fedify
- fedify-dev fedify
Weakness type
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