Incorrect Behavior Order: Validate Before Canonicalize Affecting @fedify/fedify package, versions <1.9.11>=1.10.0 <1.10.10>=2.0.0 <2.0.18>=2.1.0 <2.1.14>=2.2.0 <2.2.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-FEDIFYFEDIFY-16895732
- published27 May 2026
- disclosed26 May 2026
- creditUnknown
Introduced: 26 May 2026
CVE-2026-42462 (opens in a new tab)How to fix?
Upgrade @fedify/fedify to version 1.9.11, 1.10.10, 2.0.18, 2.1.14, 2.2.3 or higher.
Overview
@fedify/fedify is an An ActivityPub server framework
Affected versions of this package are vulnerable to Incorrect Behavior Order: Validate Before Canonicalize through manipulation of JSON-LD document structure using keywords such as @graph, @included, and @reverse. An attacker can alter the interpretation of signed activities, potentially modifying or removing attributes, replaying activities, or forging arbitrary content by restructuring the payload while preserving its signature. This can result in unauthorized changes to activity data, loss of integrity, and disruption of service by exploiting the way the application processes and verifies signed JSON-LD documents.