CVE-2026-6683

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

4.6 / 10

Vector String

                                        CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H                                    

Vulnerability Description

FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes n_fatent - 2 to be zero during write/sync operations. This maps to CWE-369 (Divide By Zero). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (4.6, Medium). Network-delivered update media can make this remote in some pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.

Vulnerability Details

Published Date

July 01, 2026

Last Modified

July 02, 2026

CWE ID

CWE-369

Source

NVD

Vendor

elm-chan

Product

fatfs

External References

https://elm-chan.org/fsw/ff/
https://github.com/runZeroInc/vulns-2026-fatfs-chance
https://www.runzero.com/advisories/fatfs-exfat-divide-by-zero-cve-2026-6683
https://www.runzero.com/blog/fatfs-bugs/
https://github.com/runZeroInc/vulns-2026-fatfs-chance

CVE-2026-6683

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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