CVE-2026-6687

HIGHPre-NVD 7.67.6—
EchelonGraph scoreMEDIUM 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(medium)
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
28%
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 10× in last 7d / 73× 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.

Showing the most recent 100 of 211 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 16:01 UTCEPSS rescore
  5. 2026-09-06 14:29 UTCEG score recompute
  6. 2026-09-06 14:29 UTCGHSA enrichment
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-06 02:25 UTCEG score recompute
  9. 2026-09-06 02:25 UTCGHSA enrichment
  10. 2026-09-05 15:31 UTCEPSS rescore
  11. 2026-09-04 05:07 UTCEPSS rescore
  12. 2026-09-02 14:12 UTCEPSS rescore
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 04:40 UTCEPSS rescore
  15. 2026-08-31 01:14 UTCEG score recompute
  16. 2026-08-31 01:14 UTCGHSA enrichment
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 13:10 UTCEG score recompute
  19. 2026-08-30 13:10 UTCGHSA enrichment
  20. 2026-08-30 01:22 UTCEPSS rescore
  21. 2026-08-28 21:42 UTCEPSS rescore
  22. 2026-08-27 22:27 UTCEG score recompute
  23. 2026-08-27 22:27 UTCGHSA enrichment
  24. 2026-08-26 14:47 UTCEPSS rescore
  25. 2026-08-25 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-24 23:01 UTCEG score recompute
  2. 2026-08-24 23:01 UTCGHSA enrichment
  3. 2026-08-24 10:54 UTCEG score recompute
  4. 2026-08-24 10:54 UTCGHSA enrichment
  5. 2026-08-23 20:29 UTCGHSA enrichment
  6. 2026-08-23 08:25 UTCEG score recompute
  7. 2026-08-23 08:25 UTCGHSA enrichment
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-22 20:03 UTCGHSA enrichment
  10. 2026-08-22 07:21 UTCEG score recompute
  11. 2026-08-22 07:21 UTCGHSA enrichment
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-21 17:17 UTCGHSA enrichment
  14. 2026-08-21 04:58 UTCEG score recompute
  15. 2026-08-21 04:58 UTCGHSA enrichment
  16. 2026-08-20 22:56 UTCEPSS rescore
  17. 2026-08-20 16:55 UTCGHSA enrichment
  18. 2026-08-20 04:44 UTCEG score recompute
  19. 2026-08-20 04:44 UTCGHSA enrichment
  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-19 09:55 UTCGHSA enrichment
  22. 2026-08-18 21:00 UTCEG score recompute
  23. 2026-08-18 21:00 UTCGHSA enrichment
  24. 2026-08-18 13:49 UTCEPSS rescore
  25. 2026-08-18 13:49 UTCEPSS rescore
  26. 2026-08-18 04:50 UTCEG score recompute
  27. 2026-08-18 04:50 UTCGHSA enrichment
  28. 2026-08-17 13:47 UTCEPSS rescore
  29. 2026-08-17 12:26 UTCGHSA enrichment
  30. 2026-08-17 00:19 UTCEG score recompute
  31. 2026-08-17 00:19 UTCGHSA enrichment
  32. 2026-08-16 14:56 UTCEPSS rescore
  33. 2026-08-16 14:56 UTCEPSS rescore
  34. 2026-08-16 12:16 UTCEG score recompute
  35. 2026-08-16 12:16 UTCGHSA enrichment
  36. 2026-08-16 02:15 UTCEPSS rescore
  37. 2026-08-16 00:13 UTCGHSA enrichment
  38. 2026-08-15 12:09 UTCEG score recompute
  39. 2026-08-15 12:09 UTCGHSA enrichment
  40. 2026-08-15 01:31 UTCEPSS rescore
  41. 2026-08-15 00:05 UTCGHSA enrichment
  42. 2026-08-14 12:01 UTCGHSA enrichment
  43. 2026-08-13 23:58 UTCEG score recompute
  44. 2026-08-13 23:58 UTCGHSA enrichment
  45. 2026-08-13 22:00 UTCEPSS rescore
  46. 2026-08-13 11:54 UTCGHSA enrichment
  47. 2026-08-12 23:50 UTCEG score recompute
  48. 2026-08-12 23:50 UTCGHSA enrichment
  49. 2026-08-12 13:51 UTCEPSS rescore
  50. 2026-08-12 11:47 UTCGHSA enrichment
  51. 2026-08-11 23:43 UTCEG score recompute
  52. 2026-08-11 23:43 UTCGHSA enrichment
  53. 2026-08-11 11:38 UTCEG score recompute
  54. 2026-08-11 11:38 UTCGHSA enrichment
  55. 2026-08-11 00:00 UTCEPSS rescore
  56. 2026-08-10 23:35 UTCGHSA enrichment
  57. 2026-08-10 11:31 UTCGHSA enrichment
  58. 2026-08-09 23:26 UTCEG score recompute
  59. 2026-08-09 23:26 UTCGHSA enrichment
  60. 2026-08-09 13:47 UTCEPSS rescore
  61. 2026-08-09 11:23 UTCGHSA enrichment
  62. 2026-08-08 23:19 UTCEG score recompute
  63. 2026-08-08 23:19 UTCGHSA enrichment
  64. 2026-08-08 16:37 UTCEPSS rescore
  65. 2026-08-08 11:15 UTCGHSA enrichment
  66. 2026-08-07 23:11 UTCEG score recompute
  67. 2026-08-07 23:11 UTCGHSA enrichment
  68. 2026-08-07 11:08 UTCGHSA enrichment
  69. 2026-08-06 23:04 UTCEG score recompute
  70. 2026-08-06 23:04 UTCGHSA enrichment
  71. 2026-08-06 13:47 UTCEPSS rescore
  72. 2026-08-06 10:17 UTCGHSA enrichment
  73. 2026-08-05 22:13 UTCEG score recompute
  74. 2026-08-05 22:13 UTCGHSA enrichment
  75. 2026-08-05 19:17 UTCEPSS rescore

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 72.0% 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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