CVE-2026-42462
7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| fedify-dev | fedify | >= 2.2.0, < 2.2.3 | affected |
| fedify-dev | fedify | >= 2.1.0, < 2.1.14 | affected |
| fedify-dev | fedify | >= 2.0.0, < 2.0.18 | affected |
| fedify-dev | fedify | >= 1.10.0, < 1.10.10 | affected |
| fedify-dev | fedify | < 1.9.11 | affected |
Weaknesses
- CWE-180: CWE-180: Incorrect Behavior Order: Validate Before Canonicalize
- CWE-347: CWE-347: Improper Verification of Cryptographic Signature
- CWE-436: CWE-436: Interpretation Conflict
- CWE-1289: CWE-1289: Improper Validation of Unsafe Equivalence in Input
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
- https://github.com/fedify-dev/fedify/releases/tag/2.2.3
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