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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.

PUBLISHED Reserved 2026-04-27 | Published 2026-06-10 | Updated 2026-06-10 | Assigner GitHub_M




HIGH: 7.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

Problem types

CWE-180: Incorrect Behavior Order: Validate Before Canonicalize

CWE-347: Improper Verification of Cryptographic Signature

CWE-436: Interpretation Conflict

CWE-1289: Improper Validation of Unsafe Equivalence in Input

Product status

>= 2.2.0, < 2.2.3
affected

>= 2.1.0, < 2.1.14
affected

>= 2.0.0, < 2.0.18
affected

>= 1.10.0, < 1.10.10
affected

< 1.9.11
affected

References

github.com/...fedify/security/advisories/GHSA-9rfg-v8g9-9367

github.com/fedify-dev/fedify/releases/tag/2.2.3

cve.org (CVE-2026-42462)

nvd.nist.gov (CVE-2026-42462)

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