TI-2026-05867 CVE-2026-6688 · GHSA-8vm2-mjff-2gg2
FatFs Buffer Overflow via Unbounded LFN Filename Copy
Priority HIGH 68
FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename handling.
ChaN
Records6All Threatist records
Exploited (KEV)0None in CISA KEV
CVSS critical0CVSS 9.0–10.0
CVSS high3CVSS 7.0–8.9
Exploited now
ChaN records in CISA KEVNo ChaN vulnerabilities are listed in CISA KEV.
Components
Products in the NVD configurations · select one to filter the recordsRecords
6 records
TI-2026-05866 CVE-2026-6687 · GHSA-wghw-hg6m-7rh3
FatFs Stack Buffer Overflow via Uncapped exFAT Label Length
Priority HIGH 68
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.
TI-2026-05862 CVE-2026-6682 · GHSA-c25x-vcg6-4ccx
FatFs Integer Overflow in FAT32 Volume Mount
Priority HIGH 68
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.
TI-2026-05865 CVE-2026-6686 · GHSA-h94p-vjqx-v7rr
FatFs Use of Uninitialized Clusters After Seek Past EOF
Priority MEDIUM 54
FatFs R0.16 and earlier contains an uninitialized cluster exposure when f_lseek() extends files beyond EOF without zero-filling newly allocated clusters.
TI-2026-05864 CVE-2026-6684 · GHSA-vhc7-qgwj-vx6v
FatFs Infinite Loop in GPT Partition Scan
Priority MEDIUM 54
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.
TI-2026-05863 CVE-2026-6683 · GHSA-74cg-p8q3-4c3q
FatFs Divide-by-Zero in exFAT Sync
Priority LOW 21
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.