Integer Underflow (Wrap or Wraparound) The advisory has been revoked - it doesn't affect any version of package abbrev/fatfs (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ABBREVFATFS-17754190
- published1 Jul 2026
- disclosed1 Jul 2026
- creditUnknown
Introduced: 1 Jul 2026
CVE-2026-6685 (opens in a new tab)How to fix?
There is no fixed version for abbrev/fatfs.
Amendment
This was deemed not a vulnerability.
Overview
Affected versions of this package are vulnerable to Integer Underflow (Wrap or Wraparound) via the f_read or f_write process when handling interleaved read and write operations on fragmented filesystems, due to an unsigned-subtraction wrap in the calculation (fp->sect - sect < cc). An attacker can cause data integrity loss or denial of service by exploiting this arithmetic flaw to bypass dirty-sector cache flushing.
Note: CVE-2026-6685 was rejected by the CVE List.