CVE-2026-42462
Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring
CVSS Score
7.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-180 CWE-347 CWE-436 CWE-1289 |
| Vendor | fedify-dev |
| Product | fedify |
| Published | Jun 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low
Affected 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