CVE-2026-42462: Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring
fedify-dev · fedify
Affected: fedify-dev · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 6% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- fedify-dev · fedify>= 2.2.0, < 2.2.3; >= 2.1.0, < 2.1.14; >= 2.0.0, < 2.0.18; >= 1.10.0, < 1.10.10; < 1.9.11
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- fedify-dev
- Published
- June 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-42462 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.