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CVE-2026-6688

HighPublished

FatFs Buffer Overflow via Unbounded LFN Filename Copy

Published: Jul 1, 2026
Updated: Jul 1, 2026
Assigning CNA: runZero
Evidence observed: Aug 16, 2026

Primary CVSS

7.6/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 25.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

vulns-2026-fatfs-chanceResearch
Documented security vulnerabilities in the FatFs embedded filesystem library with CVE details, fuzzing harness, exploit disk-image generator, and supply-chain impact analysis across dozens of downstream firmware projects.

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