> CVE-2026-42462 [HIGH]

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PUBLISHED
2026-06-10 22:16
MODIFIED
2026-06-10 22:16
CVSS_SCORE V3
7.0
EPSS (Prob. Exploit)
0.25%
Top 84.7%
DATA SOURCES:
NVD 🔗 2026-06-10 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-10-29

> 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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
EXPLOITABILITY
2.2
IMPACT
4.7

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-180 CWE-347 CWE-436 CWE-1289

> CWE DETAILED DESCRIPTIONS

CWE-180: Incorrect Behavior Order: Validate Before Canonicalize - The product validates input before it is canonicalized. | CWE-347: Improper Verification of Cryptographic Signature - The product does not verify, or incorrectly verifies, the cryptographic signature for data. | CWE-436: Interpretation Conflict - Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state. | CWE-1289: Improper Validation of Unsafe Equivalence in Input - The product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value.

> GITHUB SECURITY ADVISORY

GHSA-9rfg-v8g9-9367 HIGH

Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

AFFECTED PACKAGES:
NPM / @fedify/fedify
< 1.9.11
Fixed in: 1.9.11
NPM / @fedify/fedify
>= 1.10.0, < 1.10.10
Fixed in: 1.10.10
NPM / @fedify/fedify
>= 2.0.0, < 2.0.18
Fixed in: 2.0.18
NPM / @fedify/fedify
>= 2.1.0, < 2.1.14
Fixed in: 2.1.14
NPM / @fedify/fedify
>= 2.2.0, < 2.2.3
Fixed in: 2.2.3

> HISTORIQUE DES MODIFICATIONS

Première apparition
10/06/2026 22:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-180: Incorrect Behavior Order: Validate Before Canonicalize - The product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the ...
Nouvelle valeur:
CWE-180: Incorrect Behavior Order: Validate Before Canonicalize - The product validates input before it is canonicalized. | CWE-347: Improper Verification of Cryptographic Signature - The product does...
📊 ENRICHISSEMENT 01/07/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-180: Incorrect Behavior Order: Validate Before Canonicalize - The product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the ...
Total des modifications: 2 Dernière mise à jour: 6 days ago

> REFERENCES

https://github.com/fedify-dev/fedify/releases/tag/2.2.3
https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
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