CVE-2026-6687

highCVSS 7.6covered by 1 sourcefirst seen 2026-07-01

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.

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Exploitation outlook

Low exploitation risk0.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-6687: FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label lengt…nvd · 2026-07-01

External references

NVD record for CVE-2026-6687

CVE.org record

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