CVE-2026-70637

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. 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 through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity59% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c | Advisories | VulnCheck

https://www.vulncheck.com/advisories/lightftp-data-race-condition-via-abor-command-in-ftpserv-c
generic

[SECURITY] LightFTP: concurrent fd close race — worker_thread_cleanup vs transfer worker thread · Issue #75 · hfiref0x/LightFTP · GitHub

https://github.com/hfiref0x/LightFTP/issues/75

Vendor Advisories for CVE-2026-70637(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 18× in last 7d / 74× 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 118 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-70637?
CVE-2026-70637 is a medium vulnerability published on August 6, 2026. LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes datasocket and filefd descriptors while worker threads concurrently…
When was CVE-2026-70637 disclosed?
CVE-2026-70637 was first published in the National Vulnerability Database on August 6, 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-2026-70637 actively exploited?
CVE-2026-70637 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 86.2% of all scored CVEs.
What is the CVSS score of CVE-2026-70637?
CVE-2026-70637 has a CVSS v4.0 base score of 5.9 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-70637?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70637, 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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