CVE-2026-6687

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
7.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.6Exploit: None knownExposed: 0

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

FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabel) is trusted without enforcing spec maximums. This maps to CWE-121 (Stack-based Buffer Overflow). 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). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.

CVSS v3
7.6
EG Score
7.6(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity76% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
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 exFAT label-length stack overflow in f_getlabel()

https://www.runzero.com/advisories/fatfs-exfat-label-len-of-cve-2026-6687/

Vendor Advisories for CVE-2026-6687(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 19× in last 7d / 78× 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. 2026-07-28 04:04 UTCGHSA enrichment
  2. 2026-07-27 16:00 UTCEG score recompute
  3. 2026-07-27 16:00 UTCGHSA enrichment
  4. 2026-07-27 14:14 UTCEPSS rescore
  5. 2026-07-27 01:25 UTCEG score recompute
  6. 2026-07-27 01:25 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 13:19 UTCEG score recompute
  9. 2026-07-26 13:19 UTCGHSA enrichment
  10. 2026-07-25 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-24 14:18 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 14:18 UTCEPSS rescore
  15. 2026-07-23 03:22 UTCEG score recompute
  16. 2026-07-22 14:08 UTCEPSS rescore
  17. 2026-07-22 14:08 UTCEPSS rescore
  18. 2026-07-21 15:25 UTCEPSS rescore
  19. 2026-07-21 15:25 UTCEPSS rescore
  20. 2026-07-20 17:08 UTCEPSS rescore
  21. 2026-07-19 14:31 UTCEPSS rescore
  22. 2026-07-19 02:29 UTCEPSS rescore
  23. 2026-07-18 10:04 UTCEPSS rescore
  24. 2026-07-16 18:51 UTCGHSA enrichment
  25. 2026-07-16 17:03 UTCEPSS rescore
Show 53 more
  1. 2026-07-16 06:47 UTCGHSA enrichment
  2. 2026-07-15 18:35 UTCGHSA enrichment
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 06:21 UTCGHSA enrichment
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-14 18:17 UTCGHSA enrichment
  7. 2026-07-14 06:14 UTCGHSA enrichment
  8. 2026-07-13 22:31 UTCEPSS rescore
  9. 2026-07-13 18:09 UTCGHSA enrichment
  10. 2026-07-13 06:13 UTCEPSS rescore
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-13 06:04 UTCGHSA enrichment
  13. 2026-07-12 17:57 UTCGHSA enrichment
  14. 2026-07-12 05:53 UTCGHSA enrichment
  15. 2026-07-12 05:46 UTCEPSS rescore
  16. 2026-07-11 17:49 UTCGHSA enrichment
  17. 2026-07-11 08:27 UTCEPSS rescore
  18. 2026-07-11 08:27 UTCEPSS rescore
  19. 2026-07-11 05:45 UTCGHSA enrichment
  20. 2026-07-10 17:41 UTCGHSA enrichment
  21. 2026-07-10 05:37 UTCGHSA enrichment
  22. 2026-07-09 19:10 UTCEPSS rescore
  23. 2026-07-09 19:10 UTCEPSS rescore
  24. 2026-07-09 17:31 UTCGHSA enrichment
  25. 2026-07-09 05:23 UTCGHSA enrichment
  26. 2026-07-08 17:20 UTCGHSA enrichment
  27. 2026-07-08 15:16 UTCEPSS rescore
  28. 2026-07-08 15:16 UTCEPSS rescore
  29. 2026-07-08 05:15 UTCGHSA enrichment
  30. 2026-07-07 17:12 UTCGHSA enrichment
  31. 2026-07-07 13:46 UTCEPSS rescore
  32. 2026-07-07 13:46 UTCEPSS rescore
  33. 2026-07-07 05:05 UTCGHSA enrichment
  34. 2026-07-06 16:59 UTCGHSA enrichment
  35. 2026-07-06 16:27 UTCEPSS rescore
  36. 2026-07-06 16:27 UTCEPSS rescore
  37. 2026-07-06 04:55 UTCGHSA enrichment
  38. 2026-07-06 02:23 UTCEPSS rescore
  39. 2026-07-06 02:23 UTCEPSS rescore
  40. 2026-07-05 16:50 UTCGHSA enrichment
  41. 2026-07-05 04:45 UTCGHSA enrichment
  42. 2026-07-05 02:31 UTCEPSS rescore
  43. 2026-07-05 02:30 UTCEPSS rescore
  44. 2026-07-04 16:36 UTCGHSA enrichment
  45. 2026-07-04 06:31 UTCEPSS rescore
  46. 2026-07-04 06:31 UTCEPSS rescore
  47. 2026-07-04 04:29 UTCGHSA enrichment
  48. 2026-07-03 16:22 UTCGHSA enrichment
  49. 2026-07-03 04:18 UTCGHSA enrichment
  50. 2026-07-02 16:10 UTCGHSA enrichment
  51. 2026-07-02 04:06 UTCGHSA enrichment
  52. 2026-07-01 16:02 UTCEG score recompute
  53. 2026-07-01 16:02 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6687?
CVE-2026-6687 is a high vulnerability published on July 1, 2026. FatFs R0.16 and earlier contains a stack overflow bug in fgetlabel() because exFAT label length (XDIRNumLabel) is trusted without enforcing spec maximums. This maps to CWE-121 (Stack-based Buffer Overflow). 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). The…
When was CVE-2026-6687 disclosed?
CVE-2026-6687 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-2026-6687 actively exploited?
CVE-2026-6687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.7% of all scored CVEs.
What is the CVSS score of CVE-2026-6687?
CVE-2026-6687 has a CVSS v3 base score of 7.6 (NVD).
How do I remediate CVE-2026-6687?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6687, 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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