CVE-2026-67607

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory (severity: HIGH) published 2026-07-31. A secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.9Exploit: Elevated riskExposed services: Not assessed

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

LightFTP 2.3.1 contains a residual race condition vulnerability (an incomplete fix for CVE-2024-11144) in the worker_thread_cleanup() function of ftpserv.c that allows remote unauthenticated attackers to destabilize or crash the daemon by triggering unsynchronized access to shared per-connection state without holding the required mutex lock. Attackers can send a data-transfer command such as LIST followed immediately by ABOR to exploit the missing synchronization on shared context and detached thread id reuse, resulting in daemon destabilization or crash which can lead to a denial of service. The 2.3.1 patch only narrowed the timing window (an extra re-check and reordered cleanup), it never added the missing lock, so the underlying race remains.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
58
EG Risk 58/100CISA SSVC

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
Severity59% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 31, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Jul 31, 2026
No patch confirmed yet.
generic

LightFTP 2.3.1 Race Condition DoS via worker_thread_cleanup | Advisories | VulnCheck

https://www.vulncheck.com/advisories/lightftp-race-condition-dos-via-worker-thread-cleanup
generic

GitHub - zeroscience/tuktam: TOCTOU Race Detector · GitHub

https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11144

Vendor Advisories for CVE-2026-67607(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 13× in last 7d / 63× 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 164 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-67607?
CVE-2026-67607 is a medium vulnerability published on July 31, 2026. LightFTP 2.3.1 contains a residual race condition vulnerability (an incomplete fix for CVE-2024-11144) in the workerthreadcleanup() function of ftpserv.c that allows remote unauthenticated attackers to destabilize or crash the daemon by triggering unsynchronized access to shared per-connection…
When was CVE-2026-67607 disclosed?
CVE-2026-67607 was first published on July 31, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67607 actively exploited?
CVE-2026-67607 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67607?
CVE-2026-67607 has a CVSS base score of 5.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-67607?
No fix for CVE-2026-67607 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-2026-67607 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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