Dashboard / CVE-2026-6688

CVE-2026-6688

HIGH
MEDIUM Priority: 0.02 BB Relevance: 50/100
Published: 2026-07-01 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Auth No Interaction Conf. Impact Integ. Impact Scope Change

CVSS Vector Breakdown

AV: Physical
AC: Low
PR: None
UI: None
S: Changed
C: High
I: High
A: High

Description

FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename handling. With LFN enabled, fno.fname can be up to 255 characters; many callers copy it into short fixed buffers without bounds checks, causing overflow. This maps to CWE-120 (Buffer Copy without Checking Size of Input). 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). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
elm-chan fatfs < r0.16

References & Advisories (4)

https://www.runzero.com/blog/fatfs-bugs/
Third Party Advisory Exploit

Bug Bounty Relevance

50 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.6 / 10.0 v3.1
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploitation Probability

0.32%
Raw Score 0.003220
Percentile 25.2%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00322
2026-10-28
0.00322

Intelligence Sources

nvd ref →

External Links