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

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Summary

CVECVE-2026-42462
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-10 22:16:57 UTC
Updated2026-06-11 15:34:28 UTC
DescriptionFedify 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.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
3.1CNADECLARED7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fedify-dev Fedify affected >= 2.2.0, < 2.2.3 Not specified
CNA Fedify-dev Fedify affected >= 2.1.0, < 2.1.14 Not specified
CNA Fedify-dev Fedify affected >= 2.0.0, < 2.0.18 Not specified
CNA Fedify-dev Fedify affected >= 1.10.0, < 1.10.10 Not specified
CNA Fedify-dev Fedify affected < 1.9.11 Not specified

References

ReferenceSourceLinkTags
github.com/fedify-dev/fedify/releases/tag/2.2.3 [email protected] github.com
github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367 [email protected] github.com
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