CVE-2026-6687
7.6 · HIGHOverview
CVE-2026-6687 is a high-severity vulnerability affecting elm-chan fatfs. 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 stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabel) is trusted without enforcing spec maximums. This maps to CWE-121 (Stack-based Buffer Overflow). 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 and patches from elm-chan. Update fatfs to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| elm-chan | fatfs | 0 | Affected |
Frequently Asked Questions
What is CVE-2026-6687?
CVE-2026-6687 is a high-severity vulnerability affecting elm-chan fatfs. It was published on July 1, 2026 and has a CVSS 3.1 base score of 7.6 (HIGH).
How severe is CVE-2026-6687?
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-2026-6687?
Check the references section for vendor advisories and patches from elm-chan. Update fatfs to the latest patched version. 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-2026-6687?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-6687 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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