CVE-2026-6682

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.

• CWE-190

• https://elm-chan.org/fsw/ff/Product
• https://github.com/runZeroInc/vulns-2026-fatfs-chanceThird Party Advisory, Exploit
• https://www.runzero.com/advisories/fatfs-fat32-int-of-mnt-cve-2026-6682/Third Party Advisory, Exploit
• https://www.runzero.com/blog/fatfs-bugs/Third Party Advisory, Exploit
• https://github.com/runZeroInc/vulns-2026-fatfs-chanceThird Party Advisory, Exploit

Published

Jul 1, 2026

Last Modified

Jul 2, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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