CVE-2026-67607

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreHIGH confidence

Score 5.9 from GitHub Security Advisory (severity: HIGH) published 2026-07-31. the CNA's CVSS baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
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%CVSS: 5.9Exploit: Elevated riskExposed: 0

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

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
5.9(high)
EG Risk
58(Attend)
EG Risk 58/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 14, 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 21× 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.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 14:46 UTCEG score recompute
  3. 2026-08-20 14:46 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 15:21 UTCGHSA enrichment
  6. 2026-08-18 15:51 UTCEG score recompute
  7. 2026-08-18 15:50 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 15:24 UTCEG score recompute
  10. 2026-08-17 15:24 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 16:00 UTCEG score recompute
  13. 2026-08-16 16:00 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-15 16:36 UTCEG score recompute
  16. 2026-08-15 16:36 UTCGHSA enrichment
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 17:11 UTCEG score recompute
  19. 2026-08-14 17:11 UTCGHSA enrichment
  20. 2026-08-14 13:51 UTCEG score recompute
  21. 2026-08-14 13:51 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 14:27 UTCGHSA enrichment
  24. 2026-08-12 14:58 UTCEG score recompute
  25. 2026-08-12 14:58 UTCGHSA enrichment
Show 38 more
  1. 2026-08-12 13:51 UTCEPSS rescore
  2. 2026-08-11 15:34 UTCEG score recompute
  3. 2026-08-11 15:34 UTCGHSA enrichment
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 16:10 UTCGHSA enrichment
  6. 2026-08-09 16:46 UTCEG score recompute
  7. 2026-08-09 16:46 UTCGHSA enrichment
  8. 2026-08-09 13:47 UTCEPSS rescore
  9. 2026-08-08 17:22 UTCEG score recompute
  10. 2026-08-08 17:22 UTCGHSA enrichment
  11. 2026-08-08 16:37 UTCEPSS rescore
  12. 2026-08-07 17:57 UTCEG score recompute
  13. 2026-08-07 17:57 UTCGHSA enrichment
  14. 2026-08-06 18:33 UTCEG score recompute
  15. 2026-08-06 18:33 UTCGHSA enrichment
  16. 2026-08-06 13:47 UTCEPSS rescore
  17. 2026-08-05 19:17 UTCEPSS rescore
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 19:09 UTCGHSA enrichment
  20. 2026-08-04 19:45 UTCEG score recompute
  21. 2026-08-04 19:45 UTCGHSA enrichment
  22. 2026-08-04 15:10 UTCEPSS rescore
  23. 2026-08-04 10:39 UTCEPSS rescore
  24. 2026-08-03 20:20 UTCEG score recompute
  25. 2026-08-03 20:20 UTCGHSA enrichment
  26. 2026-08-03 20:14 UTCEG score recompute
  27. 2026-08-03 20:14 UTCGHSA enrichment
  28. 2026-08-03 15:47 UTCEG score recompute
  29. 2026-08-03 15:47 UTCGHSA enrichment
  30. 2026-08-03 10:36 UTCEPSS rescore
  31. 2026-08-02 16:23 UTCEG score recompute
  32. 2026-08-02 16:23 UTCGHSA enrichment
  33. 2026-08-02 02:27 UTCEPSS rescore
  34. 2026-08-01 16:59 UTCEG score recompute
  35. 2026-08-01 16:59 UTCGHSA enrichment
  36. 2026-07-31 17:34 UTCEG score recompute
  37. 2026-07-31 16:21 UTCEG score recompute
  38. 2026-07-31 16:18 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database on July 31, 2026, with the most recent update on August 14, 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% probability of exploitation in the next 30 days, which ranks it in the top 77.8% of all scored CVEs.
What is the CVSS score of CVE-2026-67607?
CVE-2026-67607 has a CVSS v4.0 base score of 5.9 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-67607?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67607, 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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