CVE-2026-42462 PUBLISHED

Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

Assigner: GitHub_M
Reserved: 27.04.2026 Published: 10.06.2026 Updated: 11.06.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
CVSS Score: 7

Product Status

Vendor fedify-dev
Product fedify
Versions
  • Version >= 2.2.0, < 2.2.3 is affected
  • Version >= 2.1.0, < 2.1.14 is affected
  • Version >= 2.0.0, < 2.0.18 is affected
  • Version >= 1.10.0, < 1.10.10 is affected
  • Version < 1.9.11 is affected

References

Problem Types

  • CWE-180: Incorrect Behavior Order: Validate Before Canonicalize CWE
  • CWE-347: Improper Verification of Cryptographic Signature CWE
  • CWE-436: Interpretation Conflict CWE
  • CWE-1289: Improper Validation of Unsafe Equivalence in Input CWE