CVE-2026-6687

FatFs Stack Buffer Overflow via Uncapped exFAT Label Length

CVSS 7.6 HIGHCWE-121

Vexday Risk Score

18Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 7.6EPSS —KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

01 jul 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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.

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

Productos afectados

ChaN · FatFs

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Referencias

https://elm-chan.org/fsw/ff/https://github.com/runZeroInc/vulns-2026-fatfs-chance https://www.runzero.com/advisories/fatfs-exfat-label-len-of-cve-2026-6687/https://www.runzero.com/blog/fatfs-bugs/