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CVE-2026-42462
Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring
High7.0EPSS 0.17%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L |
| NVDNVD · Deferred | 3.1 | High7.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L |
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.
Weakness
- CWE-180: Incorrect Behavior Order: Validate Before Canonicalize (opens in a new tab)All about CWE-180 and its CVEs
- CWE-347: Improper Verification of Cryptographic Signature (opens in a new tab)All about CWE-347 and its CVEs
- CWE-436: Interpretation Conflict (opens in a new tab)All about CWE-436 and its CVEs
- CWE-1289: Improper Validation of Unsafe Equivalence in Input (opens in a new tab)All about CWE-1289 and its CVEs
Affected products
- affected >= 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 packages
From reviewed advisories of the GitHub Advisory Database.
- npm@fedify/fedifyGHSA-9rfg-v8g9-9367 (opens in a new tab)
References (2)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9rfg-v8g9-9367 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-42462)Record last updated .