What is CVE-2026-6683?

CVE-2026-6683 is a medium-severity vulnerability in Chan Fatfs, classified under Divide By Zero. CVSS score: 4.6/10. Published 2026-07-01.

How severe is CVE-2026-6683?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Vulnerability in Chan Fatfs

CVE-2026-6683

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/A…

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Chan Fatfs — versions 0

Weakness classification (CWE)

CWE-369 — Divide By Zero

References

44488dab-36db-4358-99f9-bc116477f914 (third-party-advisory)
44488dab-36db-4358-99f9-bc116477f914 (technical-description)
44488dab-36db-4358-99f9-bc116477f914 (product)
44488dab-36db-4358-99f9-bc116477f914 (third-party-advisory)

Frequently asked questions

What is CVE-2026-6683?: CVE-2026-6683 is a medium-severity vulnerability in Chan Fatfs, classified under Divide By Zero. CVSS score: 4.6/10. Published 2026-07-01.
How severe is CVE-2026-6683?: Medium severity. CVSS v3 base score is 4.6 out of 10.