CVSS 3.1
7.0 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:LCVE-2026-42462
High (7.0). EPSS 0.2% chance of exploitation in the next 30 days. Fixed in @fedify/fedify 1.10.10, 1.9.11, 2.0.18.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-180, CWE-347, CWE-436, CWE-1289
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9rfg-v8g9-9367 | npm | @fedify/fedify | >=2.2.0 <2.2.3 | 2.2.3 |
| GHSA-9rfg-v8g9-9367 | npm | @fedify/fedify | >=2.1.0 <2.1.14 | 2.1.14 |
| GHSA-9rfg-v8g9-9367 | npm | @fedify/fedify | >=2.0.0 <2.0.18 | 2.0.18 |
| GHSA-9rfg-v8g9-9367 | npm | @fedify/fedify | >=1.10.0 <1.10.10 | 1.10.10 |
| GHSA-9rfg-v8g9-9367 | npm | @fedify/fedify | <1.9.11 | 1.9.11 |