CVE-2026-6686

MediumCVSS 4.6/10Last modified Jul 2, 2026

Description

FatFs R0.16 and earlier contains an uninitialized cluster exposure when f_lseek() extends files beyond EOF without zero-filling newly allocated clusters. This maps to CWE-908 (Use of Uninitialized Resource). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (4.6, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.

Metrics

CVSS 3.1 4.6/10CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-908

Affected software

No affected versions have been published.

Timeline

Published: Jul 1, 2026
Last modified: Jul 2, 2026
NVD status: Analyzed

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