CVE-2026-6685

✕ Withdrawn — historical dataMEDIUMPre-NVD 6.1Elevated
6.1CVSS
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.1Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

FatFs R0.16 and earlier exhibits a stale dirty-cache skip via unsigned-subtraction wrap in f_read() / f_write() (fp->sect - sect < cc) during interleaved read/write on fragmented filesystems. This maps to CWE-191 (Integer Underflow). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H (6.1, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.

Note that this issue has been disputed by the Supplier. It will be rejected shortly.

CVSS v3
6.1
EchelonGraph score
Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.
EG Score
—
EG Risk
—
EPSS PROB
0.2%
EPSS %ILE
10th
KEV
Not listed

Published

July 1, 2026

Last Modified

July 16, 2026

Advisory Details (3)

Auto-updated Jul 3, 2026
⚠️ Active exploitation confirmed. No fix on record yet.
generic

GitHub - runZeroInc/vulns-2026-fatfs-chance · GitHub

https://github.com/runZeroInc/vulns-2026-fatfs-chance
generic🔴 Active Exploitation

Seven FatFs bugs, one very large blast radius

https://www.runzero.com/blog/fatfs-bugs/
generic🔴 Active Exploitation

FatFS unsigned-subtraction wrap in dirty-cache handling

https://www.runzero.com/advisories/fatfs-unsigned-sub-wrap-cve-2026-6685/

Vendor Advisories for CVE-2026-6685(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 0× in last 7d / 3× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-23 06:53 UTCGHSA enrichment
  2. 2026-09-18 06:35 UTCGHSA enrichment
  3. 2026-09-12 14:47 UTCGHSA enrichment
  4. 2026-09-06 02:31 UTCGHSA enrichment
  5. 2026-08-30 18:30 UTCGHSA enrichment
  6. 2026-08-27 22:28 UTCGHSA enrichment
  7. 2026-08-23 22:23 UTCGHSA enrichment
  8. 2026-08-21 02:22 UTCGHSA enrichment
  9. 2026-08-18 06:20 UTCGHSA enrichment
  10. 2026-08-15 09:33 UTCGHSA enrichment
  11. 2026-08-12 13:31 UTCGHSA enrichment
  12. 2026-08-09 17:26 UTCGHSA enrichment
  13. 2026-08-06 21:25 UTCGHSA enrichment
  14. 2026-08-04 01:24 UTCGHSA enrichment
  15. 2026-08-01 05:22 UTCEG score recompute
  16. 2026-08-01 05:22 UTCGHSA enrichment
  17. 2026-07-29 09:20 UTCGHSA enrichment
  18. 2026-07-26 13:19 UTCEG score recompute
  19. 2026-07-26 13:19 UTCGHSA enrichment
  20. 2026-07-23 03:22 UTCEG score recompute▼ 6.10
  21. 2026-07-17 06:03 UTCGHSA enrichment
  22. 2026-07-16 17:03 UTCEPSS rescore
  23. 2026-07-16 05:08 UTCGHSA enrichment
  24. 2026-07-15 04:12 UTCGHSA enrichment
  25. 2026-07-15 02:00 UTCEPSS rescore
Show 30 more
  1. 2026-07-14 03:12 UTCGHSA enrichment
  2. 2026-07-13 22:31 UTCEPSS rescore
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-13 02:17 UTCGHSA enrichment
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-12 01:22 UTCGHSA enrichment
  8. 2026-07-11 00:27 UTCGHSA enrichment
  9. 2026-07-09 23:32 UTCGHSA enrichment
  10. 2026-07-09 19:10 UTCEPSS rescore
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-08 22:36 UTCGHSA enrichment
  13. 2026-07-08 15:16 UTCEPSS rescore
  14. 2026-07-08 15:16 UTCEPSS rescore
  15. 2026-07-07 21:40 UTCGHSA enrichment
  16. 2026-07-07 13:46 UTCEPSS rescore
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-06 20:45 UTCGHSA enrichment
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-05 19:47 UTCGHSA enrichment
  22. 2026-07-05 02:31 UTCEPSS rescore
  23. 2026-07-05 02:30 UTCEPSS rescore
  24. 2026-07-04 18:51 UTCGHSA enrichment
  25. 2026-07-04 06:31 UTCEPSS rescore
  26. 2026-07-04 06:31 UTCEPSS rescore
  27. 2026-07-03 17:54 UTCGHSA enrichment
  28. 2026-07-02 16:58 UTCGHSA enrichment
  29. 2026-07-01 16:03 UTCEG score recompute
  30. 2026-07-01 16:02 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6685?
CVE-2026-6685 is a medium vulnerability published on July 1, 2026. FatFs R0.16 and earlier exhibits a stale dirty-cache skip via unsigned-subtraction wrap in fread() / fwrite() (fp->sect - sect < cc) during interleaved read/write on fragmented filesystems. This maps to CWE-191 (Integer Underflow). Estimated CVSS v3.1 vector:…
When was CVE-2026-6685 disclosed?
CVE-2026-6685 was first published on July 1, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6685 actively exploited?
CVE-2026-6685 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (10th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6685?
CVE-2026-6685 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-6685?
No fix for CVE-2026-6685 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-6685 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-6685

Explore →

Is Your Infrastructure Affected by CVE-2026-6685?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs