CVE-2026-18638

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-11. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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

Any authenticated Velociraptor user — including one holding only the readerrole — can terminate the entire server process with a single request, by calling SetPassword with a username that does not exist.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (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

August 11, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No patch confirmed yet.
generic

CVE-2026-18638 Velociraptor server crash via the SetPassword API

http://docs.velociraptor.app/announcements/advisories/cve-2026-18638/

Vendor Advisories for CVE-2026-18638(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 66× 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 136 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18638?
CVE-2026-18638 is a medium vulnerability published on August 11, 2026. Any authenticated Velociraptor user — including one holding only the readerrole — can terminate the entire server process with a single request, by calling SetPassword with a username that does not exist.
When was CVE-2026-18638 disclosed?
CVE-2026-18638 was first published on August 11, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18638 actively exploited?
CVE-2026-18638 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18638?
CVE-2026-18638 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18638?
No fix for CVE-2026-18638 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-2026-18638 are linked in the Vendor Advisories panel on this page.

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