What is GHSA-c25x-vcg6-4ccx?

GHSA-c25x-vcg6-4ccx is a security advisory published by GitHub Security Advisories with High severity. In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *...

Which CVE IDs does GHSA-c25x-vcg6-4ccx cover?

GHSA-c25x-vcg6-4ccx covers the following CVE IDs: CVE-2026-6682. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-c25x-vcg6-4ccx?

GHSA-c25x-vcg6-4ccx has a CVSS v3 base score of 7.6, published by GitHub Security Advisories.

GHSA-c25x-vcg6-4ccxHighCVSS 7.6

In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *...

Vendor

GitHub Security Advisories

Published

July 1, 2026

Last Modified

July 1, 2026

🔗 CVE IDs covered (1)

CVE-2026-6682 →

📋 Description

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.

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2026-6682
https://elm-chan.org/fsw/ff
https://github.com/runZeroInc/vulns-2026-fatfs-chance
https://www.runzero.com/advisories/fatfs-fat32-int-of-mnt-cve-2026-6682
https://www.runzero.com/blog/fatfs-bugs
https://github.com/advisories/GHSA-c25x-vcg6-4ccx