> CVE-2026-6682 [HIGH]

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PUBLISHED
2026-07-01 15:17
MODIFIED
2026-07-01 15:17
CVSS_SCORE V3
7.6
EPSS (Prob. Exploit)
0.32%
Top 74.7%
DATA SOURCES:
NVD đź”— 2026-07-01 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-11-05

> DESCRIPTION

In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.

> 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:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EXPLOITABILITY
0.9
IMPACT
6.0

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Physical (P)
Exploit nécessite un accès physique à l'appareil
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
Changed (C)
Impact s'Ă©tend au-delĂ  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
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

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

> WEAKNESSES

CWE-190

> CWE DETAILED DESCRIPTIONS

CWE-190: Integer Overflow or Wraparound - The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

> GITHUB SECURITY ADVISORY

GHSA-wxxw-5cvc-53j7 MODERATE

Microsoft Security Advisory CVE-2026-66822 - .NET and Visual Studio Information Disclosure Vulnerability

AFFECTED PACKAGES:
NUGET / Microsoft.NETCore.App.Runtime.win-x86
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.win-x64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.win-arm64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.osx-x64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.osx-arm64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.linux-x64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.linux-musl-x64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.linux-musl-arm64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.linux-musl-arm
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32
NUGET / Microsoft.NETCore.App.Runtime.linux-arm64
>= 8.0.0, <= 8.0.31
Fixed in: 8.0.32

> HISTORIQUE DES MODIFICATIONS

Première apparition
01/07/2026 15:17
Source: NVD
đź“Š ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-190: Integer Overflow or Wraparound - The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will a...
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://elm-chan.org/fsw/ff/
https://github.com/runZeroInc/vulns-2026-fatfs-chance
https://www.runzero.com/advisories/fatfs-fat32-int-of-mnt-cve-2026-6682/
https://www.runzero.com/blog/fatfs-bugs/
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