Security Advisory

CVE-2026-6688

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-01 14:01:04

Last updated 2026-07-01 15:06:59

Assigner runZero

CVSS score 7.6

State PUBLISHED

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.

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