CVE-2026-42462

HIGH

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

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References

Scores

CVSS v3 7.0
EPSS 0.0025
EPSS Percentile 15.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-1289 CWE-180 CWE-347 CWE-436
Status published
Products (10)
fedify/fedify 0 - 1.9.11npm
fedify/fedify 1.10.0 - 1.10.10npm
fedify/fedify 2.0.0 - 2.0.18npm
fedify/fedify 2.1.0 - 2.1.14npm
fedify/fedify 2.2.0 - 2.2.3npm
fedify-dev/fedify < 1.9.11
fedify-dev/fedify >= 1.10.0, < 1.10.10
fedify-dev/fedify >= 2.0.0, < 2.0.18
fedify-dev/fedify >= 2.1.0, < 2.1.14
fedify-dev/fedify >= 2.2.0, < 2.2.3
Published Jun 10, 2026
Tracked Since Jun 11, 2026