> CVE-2026-35039 [CRITICAL]

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PUBLISHED
2026-04-06 17:17
MODIFIED
2026-04-06 17:17
CVSS_SCORE V3
9.1
EPSS (Prob. Exploit)
0.22%
Top 88.2%
DATA SOURCES:
NVD đź”— 2026-04-06 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-10-25 GITHUB đź”— 2026-11-05 OSV đź”— 2026-07-26

> DESCRIPTION

fast-jwt provides fast JSON Web Token (JWT) implementation. From 0.0.1 to before 6.1.0, setting up a custom cacheKeyBuilder method which does not properly create unique keys for different tokens can lead to cache collisions. This could cause tokens to be mis-identified during the verification process leading to valid tokens returning claims from different valid tokens and users being mis-identified as other users based on the wrong token.

> 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:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EXPLOITABILITY
3.9
IMPACT
5.2

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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
Low (L)
Peu de conditions requises 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
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-345 CWE-706 CWE-1289

> CWE DETAILED DESCRIPTIONS

CWE-345: Insufficient Verification of Data Authenticity - The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. | CWE-706: Use of Incorrectly-Resolved Name or Reference - The product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere. | 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-rp9m-7r4c-75qg CRITICAL

fast-jwt: Cache Confusion via cacheKeyBuilder Collisions Can Return Claims From a Different Token (Identity/Authorization Mixup)

AFFECTED PACKAGES:
NPM / fast-jwt
>= 0.0.1, < 6.2.0
Fixed in: 6.2.0

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

fast-jwt Affected by Cache Confusion via cacheKeyBuilder Collisions Can Return Claims From a Different Token (Identity/Authorization Mixup)

AFFECTED PACKAGES:
Unknown / Unknown
32 versions affected
ALIASES:
GHSA-rp9m-7r4c-75qg

> HISTORIQUE DES MODIFICATIONS

Première apparition
06/04/2026 17:17
Source: NVD
đź“Š ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-345: Insufficient Verification of Data Authenticity - The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. | CWE-706: Use of...
Total des modifications: 1 Dernière mise à jour: 6 months ago

> REFERENCES

https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qg
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