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Vendor

ChaN

6 known vulnerabilities.

Products

FatFs 6
All Critical High Medium Low Exploited only Public exploit

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  • Medium 4.6
    CVE-2026-6686

    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…

    ChaN FatFs
  • Medium 4.6
    CVE-2026-6684

    FatFs Infinite Loop in GPT Partition Scan

    FatFs prior to R0.16 that use GPT scanning with 'FF_LBA64 = 1' contains an issue where an unbounded loop count derived from GPT header field GPTH_PtNum, enabling extremely long or effectively infinite mount-time scans. This maps to CWE-835 (Loop with Unreacha…

    ChaN FatFs
  • Medium 4.6
    CVE-2026-6683

    FatFs Divide-by-Zero in exFAT Sync

    FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes n_fatent - 2 to be zero during write/sync operations. This maps to CWE-369 (Divide By Zero). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:…

    ChaN FatFs