{"id":"CVE-2026-6682","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-6682","summary":"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…","details":"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.","published":"2026-07-01T15:17:12.313","modified":"2026-07-02T14:37:48.377","cvss":{"score":7.6,"severity":"HIGH","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://elm-chan.org/fsw/ff/"},{"type":"EXPLOIT","url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance"},{"type":"EXPLOIT","url":"https://www.runzero.com/advisories/fatfs-fat32-int-of-mnt-cve-2026-6682/"},{"type":"EXPLOIT","url":"https://www.runzero.com/blog/fatfs-bugs/"},{"type":"EXPLOIT","url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-07-02T14:37:48.377"}}