CVE-2026-70637

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreHIGH 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(high)
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 24× in last 7d / 47× 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. 2026-08-21 06:41 UTCEG score recompute
  2. 2026-08-21 06:41 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 08:12 UTCEG score recompute
  5. 2026-08-20 08:12 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 09:44 UTCGHSA enrichment
  8. 2026-08-18 11:15 UTCEG score recompute
  9. 2026-08-18 11:15 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 12:36 UTCEG score recompute
  12. 2026-08-17 12:36 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 14:07 UTCEG score recompute
  16. 2026-08-16 14:07 UTCGHSA enrichment
  17. 2026-08-16 02:15 UTCEPSS rescore
  18. 2026-08-15 15:39 UTCEG score recompute
  19. 2026-08-15 15:39 UTCGHSA enrichment
  20. 2026-08-15 01:31 UTCEPSS rescore
  21. 2026-08-14 17:10 UTCEG score recompute
  22. 2026-08-14 17:10 UTCGHSA enrichment
  23. 2026-08-14 10:30 UTCEG score recompute
  24. 2026-08-14 10:30 UTCGHSA enrichment
  25. 2026-08-13 22:00 UTCEPSS rescore
Show 22 more
  1. 2026-08-13 12:01 UTCEG score recompute
  2. 2026-08-13 12:01 UTCGHSA enrichment
  3. 2026-08-12 13:51 UTCEPSS rescore
  4. 2026-08-12 13:33 UTCGHSA enrichment
  5. 2026-08-11 15:04 UTCEG score recompute
  6. 2026-08-11 15:04 UTCGHSA enrichment
  7. 2026-08-11 00:00 UTCEPSS rescore
  8. 2026-08-10 16:36 UTCGHSA enrichment
  9. 2026-08-09 18:03 UTCEG score recompute
  10. 2026-08-09 18:03 UTCGHSA enrichment
  11. 2026-08-09 13:47 UTCEPSS rescore
  12. 2026-08-08 19:35 UTCEG score recompute
  13. 2026-08-08 19:35 UTCGHSA enrichment
  14. 2026-08-08 16:37 UTCEPSS rescore
  15. 2026-08-07 21:07 UTCEG score recompute
  16. 2026-08-07 21:07 UTCGHSA enrichment
  17. 2026-08-06 22:39 UTCGHSA enrichment
  18. 2026-08-06 16:33 UTCEG score recompute
  19. 2026-08-06 16:33 UTCGHSA enrichment
  20. 2026-08-06 15:29 UTCEG score recompute
  21. 2026-08-06 14:44 UTCEG score recompute
  22. 2026-08-06 14:41 UTCMITRE cvelistV5first tracked

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 86.3% 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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