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ChaN

6 known vulnerabilities.

ChaN at a glance

Last 12 months
6
Critical · all time
0
Exploited · all time
0
Public exploit · all time
0
New vulnerabilities per month · last 12 months
0 5 10 December 2025: 0 vulnerabilities Dec 2025 January 2026: 0 vulnerabilities February 2026: 0 vulnerabilities March 2026: 0 vulnerabilities Mar April 2026: 0 vulnerabilities May 2026: 0 vulnerabilities June 2026: 0 vulnerabilities Jun July 2026: 6 vulnerabilities August 2026: 0 vulnerabilities September 2026: 0 vulnerabilities Sep October 2026: 0 vulnerabilities November 2026: 0 vulnerabilities
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Products

FatFs 6
All Critical High Medium Low Exploited only Public exploit

6 results · Feed

  • High 7.6
    CVE-2026-6688

    FatFs Buffer Overflow via Unbounded LFN Filename Copy

    FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename handling. With LFN enabled, fno.fname can be up to 255 characters; many callers copy it into short fixed buffers without bounds checks, causing over…

    ChaN FatFs
  • High 7.6
    CVE-2026-6687

    FatFs Stack Buffer Overflow via Uncapped exFAT Label Length

    FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabel) is trusted without enforcing spec maximums. This maps to CWE-121 (Stack-based Buffer Overflow). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:…

    ChaN FatFs
  • 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
  • High 7.6
    CVE-2026-6682

    FatFs Integer Overflow in FAT32 Volume Mount

    In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or …

    ChaN FatFs