High severity7.6NVD Advisory· Published Jul 1, 2026· Updated Jul 2, 2026
CVE-2026-6687
CVE-2026-6687
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.
Affected products
2Patches
Vulnerability mechanics
References
3- www.runzero.com/advisories/fatfs-exfat-label-len-of-cve-2026-6687/nvdThird Party Advisory
- www.runzero.com/blog/fatfs-bugs/nvdThird Party AdvisoryExploit
- elm-chan.org/fsw/ff/nvdProduct
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