# ChaN FatFs vulnerabilities

Source: https://junglewise.ai/threats/technologies/fatfs  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/fatfs.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 7 vulnerabilities in ChaN FatFs: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-6688, was published on 1 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 7 (0 critical, 0 exploited in the wild)

## About ChaN FatFs

A generic FAT/exFAT file system module for small embedded systems.

## Latest ChaN FatFs vulnerabilities

- [CVE-2026-6688: ChaN FatFs buffer overflow in long filename handling](https://junglewise.ai/threats/cve-2026-6688-chan-fatfs-buffer-overflow-in-long-filename-handling) (high, CVSS 7.6, published 1 Jul 2026)
- [CVE-2026-6687: ChaN FatFs stack overflow in f_getlabel](https://junglewise.ai/threats/cve-2026-6687-chan-fatfs-stack-overflow-in-f-getlabel) (high, CVSS 7.6, published 1 Jul 2026)
- [CVE-2026-6686: ChaN FatFs uninitialized cluster exposure in f_lseek](https://junglewise.ai/threats/cve-2026-6686-chan-fatfs-uninitialized-cluster-exposure-in-f-lseek) (medium, CVSS 4.6, published 1 Jul 2026)
- [CVE-2026-6685: ChaN FatFs integer underflow in f_read and f_write](https://junglewise.ai/threats/cve-2026-6685-chan-fatfs-integer-underflow-in-f-read-and-f-write) (medium, CVSS 6.1, published 1 Jul 2026)
- [CVE-2026-6684: ChaN FatFs infinite loop in GPT partition scanning](https://junglewise.ai/threats/cve-2026-6684-chan-fatfs-infinite-loop-in-gpt-partition-scanning) (medium, CVSS 4.6, published 1 Jul 2026)
- [CVE-2026-6683: ChaN FatFs divide by zero in exFAT sync logic](https://junglewise.ai/threats/cve-2026-6683-chan-fatfs-divide-by-zero-in-exfat-sync-logic) (medium, CVSS 4.6, published 1 Jul 2026)
- [CVE-2026-6682: ChaN FatFs integer overflow in mount_volume](https://junglewise.ai/threats/cve-2026-6682-chan-fatfs-integer-overflow-in-mount-volume) (high, CVSS 7.6, published 1 Jul 2026)

## Most severe ChaN FatFs vulnerabilities

- [CVE-2026-6688: ChaN FatFs buffer overflow in long filename handling](https://junglewise.ai/threats/cve-2026-6688-chan-fatfs-buffer-overflow-in-long-filename-handling) (high, CVSS 7.6, published 1 Jul 2026)
- [CVE-2026-6687: ChaN FatFs stack overflow in f_getlabel](https://junglewise.ai/threats/cve-2026-6687-chan-fatfs-stack-overflow-in-f-getlabel) (high, CVSS 7.6, published 1 Jul 2026)
- [CVE-2026-6682: ChaN FatFs integer overflow in mount_volume](https://junglewise.ai/threats/cve-2026-6682-chan-fatfs-integer-overflow-in-mount-volume) (high, CVSS 7.6, published 1 Jul 2026)
- [CVE-2026-6685: ChaN FatFs integer underflow in f_read and f_write](https://junglewise.ai/threats/cve-2026-6685-chan-fatfs-integer-underflow-in-f-read-and-f-write) (medium, CVSS 6.1, published 1 Jul 2026)
- [CVE-2026-6686: ChaN FatFs uninitialized cluster exposure in f_lseek](https://junglewise.ai/threats/cve-2026-6686-chan-fatfs-uninitialized-cluster-exposure-in-f-lseek) (medium, CVSS 4.6, published 1 Jul 2026)
- [CVE-2026-6684: ChaN FatFs infinite loop in GPT partition scanning](https://junglewise.ai/threats/cve-2026-6684-chan-fatfs-infinite-loop-in-gpt-partition-scanning) (medium, CVSS 4.6, published 1 Jul 2026)
- [CVE-2026-6683: ChaN FatFs divide by zero in exFAT sync logic](https://junglewise.ai/threats/cve-2026-6683-chan-fatfs-divide-by-zero-in-exfat-sync-logic) (medium, CVSS 4.6, published 1 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "ChaN FatFs vulnerabilities", https://junglewise.ai/threats/technologies/fatfs, 9 November 2026.