PatchTheCVEelm-chan vulnerabilities
Recent CVEs affecting elm-chan products. 6 tracked.
elm-chan has 6 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 6. Most recent: 2026-07-01. Highest priority: CVE-2026-6687 (score 39/100).
- CVE-2026-6687 HIGH 7.6 UPGRADE FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabe
- CVE-2026-6682 HIGH 7.6 UPGRADE In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats
- CVE-2026-6688 HIGH 7.6 UPGRADE FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename
- CVE-2026-6683 MEDIUM 4.6 UPGRADE FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes n_faten
- CVE-2026-6684 MEDIUM 4.6 UPGRADE FatFs prior to R0.16 that use GPT scanning with 'FF_LBA64 = 1' contains an issue where an unbounded loop count
- CVE-2026-6686 MEDIUM 4.6 UPGRADE FatFs R0.16 and earlier contains an uninitialized cluster exposure when f_lseek() extends files beyond EOF wit
FAQ
How do I fix elm-chan vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is elm-chan being exploited right now?
None of the tracked elm-chan CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which elm-chan CVE should I patch first?
CVE-2026-6687 currently ranks highest (39/100): FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabe.