CVE-2026-6683
FatFs Divide-by-Zero in exFAT Sync
Description
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:N/I:N/A:H (4.6, Medium). Network-delivered update media can make this remote in some pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.
INFO
Published Date :
July 1, 2026, 1:41 p.m.
Last Modified :
July 1, 2026, 2:11 p.m.
Remotely Exploit :
No
Source :
runZero
Affected Products
The following products are affected by CVE-2026-6683
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 44488dab-36db-4358-99f9-bc116477f914 |
Solution
- Update FatFs to a patched version.
- Avoid using crafted metadata for exFAT sync.
- Limit write access to file system metadata.
Public PoC/Exploit Available at Github
CVE-2026-6683 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
CSS HTML C Dockerfile CMake Shell Python Go Makefile
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-6683 vulnerability anywhere in the article.