CVE-2026-6682

HIGHPre-NVD 7.67.6—
EchelonGraph scoreHIGH confidence

Score 7.6 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. a secondary CVSS source baseline 7.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.6Exploit: NoneExposed: 0

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

In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.

CVSS v3
7.6
EG Score
7.6(high)
EPSS
11.3%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 2, 2026

Advisory Details (3)

Auto-updated Jul 2, 2026
⚠️ Active exploitation confirmed. No patch confirmed 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 FAT32 integer overflow in mount_volume()

https://www.runzero.com/advisories/fatfs-fat32-int-of-mnt-cve-2026-6682/

Vendor Advisories for CVE-2026-6682(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 30× in last 7d / 30× 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. 2026-07-06 21:38 UTCEG score recompute
  2. 2026-07-06 21:38 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 09:07 UTCEG score recompute
  6. 2026-07-06 09:07 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 20:35 UTCEG score recompute
  10. 2026-07-05 20:34 UTCGHSA enrichment
  11. 2026-07-05 08:03 UTCEG score recompute
  12. 2026-07-05 08:03 UTCGHSA enrichment
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 19:24 UTCEG score recompute
  16. 2026-07-04 19:24 UTCGHSA enrichment
  17. 2026-07-04 06:53 UTCEG score recompute
  18. 2026-07-04 06:53 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-03 18:14 UTCEG score recompute
  22. 2026-07-03 18:14 UTCGHSA enrichment
  23. 2026-07-03 05:42 UTCEG score recompute
  24. 2026-07-03 05:42 UTCGHSA enrichment
  25. 2026-07-02 17:11 UTCEG score recompute
Show 5 more
  1. 2026-07-02 17:10 UTCGHSA enrichment
  2. 2026-07-02 04:34 UTCEG score recompute
  3. 2026-07-02 04:33 UTCGHSA enrichment
  4. 2026-07-01 16:03 UTCEG score recompute
  5. 2026-07-01 16:02 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-6682?
CVE-2026-6682 is a high vulnerability published on July 1, 2026. In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mountvolume() where fasize *= fs->nfats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector:…
When was CVE-2026-6682 disclosed?
CVE-2026-6682 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6682 actively exploited?
CVE-2026-6682 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6682?
CVE-2026-6682 has a CVSS v3 base score of 7.6 (NVD).
How do I remediate CVE-2026-6682?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6682, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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