CVE-2026-42462: high-severity vulnerability in fedify-dev fedify
Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7epss 0.2%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Affected products
fedify-dev · fedifyRelated CVEs — fedify-dev fedify
In the same product, most dangerous first.
CVE-2025-54888HIGH@fedify/fedify: Improper Authentication and Incorrect AuthorizationEPSS 0.6%CVE-2025-68475HIGHFedify has ReDoS Vulnerability in HTML Parsing RegexEPSS 0.6%CVE-2026-62857HIGHFedify: Server-Side Request Forgery in getNodeInfo() Allows Access to Internal Network ResourcesEPSS 0.4%CVE-2026-50131HIGHFedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 rangesEPSS 0.4%