4.6

CVE-2026-6686

Medienbericht
Exploit

FatFs Use of Uninitialized Clusters After Seek Past EOF

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Elm-chan ≫ Fatfs Version <= r0.16
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.38% 0.303
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
44488dab-36db-4358-99f9-bc116477f914 4.6 0.9 3.6
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-908 Use of Uninitialized Resource

The product uses or accesses a resource that has not been initialized.

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VulnDex Intel
Media Report
03.07.2026 23:46
https://www.runzero.com/blog/fatfs-bugs/
Third Party Advisory
Exploit
https://github.com/runZeroInc/vulns-2026-fatfs-chance
Third Party Advisory
Exploit
https://elm-chan.org/fsw/ff/
Product
https://www.runzero.com/advisories/fatfs-uninit-cluster-exposure-cve-2026-6686/
Third Party Advisory