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CVE-2026-6688

7.6 · HIGH

FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename handling.

Published Jul 1, 2026CWE-120EPSS 0.32%

Overview

CVE-2026-6688 is a high-severity vulnerability. It was published on July 1, 2026 and has a CVSS 3.1 base score of 7.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refelm-chan.org/fsw/ff/GitHubgithub.com/runZeroInc/vulns-2026-fatfs-chanceRefwww.runzero.com/advisories/fatfs-long-fn-of-downstream-cve-2026-6688/Refwww.runzero.com/blog/fatfs-bugs/GitHubgithub.com/runZeroInc/vulns-2026-fatfs-chance

How CyberStrike helps

Frequently asked questions

What is CVE-2026-6688?

CVE-2026-6688 is a high-severity vulnerability. It was published on July 1, 2026 and has a CVSS 3.1 base score of 7.6 (HIGH).

How severe is CVE-2026-6688?

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-6688?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-6688?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-6688 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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