CVE-2026-86542

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. the CNA's CVSS baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

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

knowns before 0.30.0 fails to validate import names in the import routes, allowing unauthenticated attackers to write files outside the imports directory. Attackers can supply traversal sequences in the name parameter to escape the imports directory and overwrite arbitrary files writable by the server process.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 24, 2026

Advisory Details (6)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit, github_release, github.
generic

knowns before 0.30.0 Path Traversal via Import Name | Advisories | VulnCheck

https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-import-name
github_release Patch Available

v0.30.0

Patch available: knowns-dev/knowns v0.30.0

https://github.com/knowns-dev/knowns/releases/tag/v0.30.0
github_commit

commit d3989829fb50 (knowns-dev/knowns)

Fix landed in knowns-dev/knowns commit d3989829fb50 — awaiting tagged release

https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396
generic

knowns/internal/server/routes/imports.go at v0.29.1 · knowns-dev/knowns · GitHub

https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/imports.go#L376-L420
generic

knowns/internal/server/routes/imports.go at v0.29.1 · knowns-dev/knowns · GitHub

https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/imports.go#L519-L551
github Patch Available

Unauthenticated Remote Code Execution via REST API Path Traversal + LSP Binary Override · Advisory · knowns-dev/knowns · GitHub

https://github.com/knowns-dev/knowns/security/advisories/GHSA-wh3c-v55g-qfg8

Vendor Advisories for CVE-2026-86542(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 59× in last 7d / 151× 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 151 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86542?
CVE-2026-86542 is a critical vulnerability published on September 7, 2026. knowns before 0.30.0 fails to validate import names in the import routes, allowing unauthenticated attackers to write files outside the imports directory. Attackers can supply traversal sequences in the name parameter to escape the imports directory and overwrite arbitrary files writable by the…
When was CVE-2026-86542 disclosed?
CVE-2026-86542 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86542 actively exploited?
CVE-2026-86542 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 47.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86542?
CVE-2026-86542 has a CVSS v4.0 base score of 9.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-86542?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86542, 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.

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