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CVE-2026-6686

4.6 medium SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 4.6 · elm-chanNVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:elm-chan:fatfs:*:*:*:*:*:*:*:*

References 5