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CVE-2026-6686

🗓️ 01 Jul 2026 13:55:09Reported by runZeroType 
cve
 cve
🔗 web.nvd.nist.gov👁 5 Views

FatFs CVE-2026-6686 affects FatFs R0.16 and earlier. The issue is an uninitialized cluster exposure when f_lseek() extends a file beyond EOF without zero-filling newly allocated clusters, mapping to CWE-908 (Use of Uninitialized Resource). The roo...

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-6686
1 Jul 202613:55
attackerkb
Cvelist
CVE-2026-6686 FatFs Use of Uninitialized Clusters After Seek Past EOF
1 Jul 202613:55
cvelist
EUVD
EUVD-2026-40998
1 Jul 202613:55
euvd
NVD
CVE-2026-6686
1 Jul 202615:17
nvd
Vulnrichment
CVE-2026-6686 FatFs Use of Uninitialized Clusters After Seek Past EOF
1 Jul 202613:55
vulnrichment
[
  {
    "vendor": "ChaN",
    "product": "FatFs",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThanOrEqual": "R0.16",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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01 Jul 2026 18:31Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.6
SSVC
5