CVE-2026-6682

[CVE catalog]

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.

Severity

High · CVSS 7.6CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Published

Jul 1, 2026, 3:17:12 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.32% · Oct 27, 2026

{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "fatfs",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "fatfs",
      "ranges": [
        {
          "fixed": "",
          "introduced": "",
          "last_affected": "r0.16",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-6682"
    }
  ]
}