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%CVSS: 6.5Exploit: None knownExposed: 0

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

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
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

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 19× in last 7d / 77× 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 106 total refreshes for this CVE.

  1. 2026-09-19 07:14 UTCEG score recompute
  2. 2026-09-19 07:14 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 07:01 UTCEG score recompute
  5. 2026-09-18 07:01 UTCGHSA enrichment
  6. 2026-09-17 06:57 UTCEG score recompute
  7. 2026-09-17 06:57 UTCGHSA enrichment
  8. 2026-09-16 14:07 UTCEPSS rescore
  9. 2026-09-16 06:34 UTCEG score recompute
  10. 2026-09-16 06:34 UTCGHSA enrichment
  11. 2026-09-16 05:14 UTCEPSS rescore
  12. 2026-09-15 06:30 UTCEG score recompute
  13. 2026-09-15 06:30 UTCGHSA enrichment
  14. 2026-09-14 06:03 UTCEG score recompute
  15. 2026-09-14 06:03 UTCGHSA enrichment
  16. 2026-09-13 16:46 UTCEPSS rescore
  17. 2026-09-13 05:59 UTCEG score recompute
  18. 2026-09-13 05:59 UTCGHSA enrichment
  19. 2026-09-12 15:00 UTCEPSS rescore
  20. 2026-09-12 05:55 UTCEG score recompute
  21. 2026-09-12 05:55 UTCGHSA enrichment
  22. 2026-09-11 14:52 UTCEPSS rescore
  23. 2026-09-11 09:36 UTCEPSS rescore
  24. 2026-09-11 05:50 UTCEG score recompute
  25. 2026-09-11 05:50 UTCGHSA enrichment
Show 75 more
  1. 2026-09-10 09:34 UTCEPSS rescore
  2. 2026-09-10 05:46 UTCGHSA enrichment
  3. 2026-09-09 05:42 UTCEG score recompute
  4. 2026-09-09 05:42 UTCGHSA enrichment
  5. 2026-09-08 22:00 UTCEPSS rescore
  6. 2026-09-07 17:02 UTCEG score recompute
  7. 2026-09-07 17:02 UTCGHSA enrichment
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-06 02:01 UTCEG score recompute
  11. 2026-09-06 02:01 UTCGHSA enrichment
  12. 2026-09-05 01:53 UTCEG score recompute
  13. 2026-09-05 01:53 UTCGHSA enrichment
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-04 01:48 UTCGHSA enrichment
  16. 2026-09-03 01:28 UTCEG score recompute
  17. 2026-09-03 01:27 UTCGHSA enrichment
  18. 2026-09-02 14:11 UTCEPSS rescore
  19. 2026-09-01 22:12 UTCEG score recompute
  20. 2026-09-01 22:12 UTCGHSA enrichment
  21. 2026-09-01 13:53 UTCEPSS rescore
  22. 2026-09-01 04:39 UTCEPSS rescore
  23. 2026-08-31 22:06 UTCGHSA enrichment
  24. 2026-08-30 22:01 UTCEG score recompute
  25. 2026-08-30 22:01 UTCGHSA enrichment
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 01:22 UTCEPSS rescore
  28. 2026-08-29 21:57 UTCGHSA enrichment
  29. 2026-08-28 21:53 UTCEG score recompute
  30. 2026-08-28 21:53 UTCGHSA enrichment
  31. 2026-08-28 21:41 UTCEPSS rescore
  32. 2026-08-27 19:56 UTCEG score recompute
  33. 2026-08-27 19:56 UTCGHSA enrichment
  34. 2026-08-27 14:25 UTCEPSS rescore
  35. 2026-08-26 19:52 UTCEG score recompute
  36. 2026-08-26 19:52 UTCGHSA enrichment
  37. 2026-08-26 14:46 UTCEPSS rescore
  38. 2026-08-25 19:48 UTCEG score recompute
  39. 2026-08-25 19:48 UTCGHSA enrichment
  40. 2026-08-25 13:48 UTCEPSS rescore
  41. 2026-08-24 19:44 UTCEG score recompute
  42. 2026-08-24 19:44 UTCGHSA enrichment
  43. 2026-08-23 19:41 UTCEG score recompute
  44. 2026-08-23 19:41 UTCGHSA enrichment
  45. 2026-08-23 00:19 UTCEPSS rescore
  46. 2026-08-22 19:37 UTCEG score recompute
  47. 2026-08-22 19:37 UTCGHSA enrichment
  48. 2026-08-21 23:49 UTCEPSS rescore
  49. 2026-08-21 19:33 UTCEG score recompute
  50. 2026-08-21 19:33 UTCGHSA enrichment
  51. 2026-08-20 22:55 UTCEPSS rescore
  52. 2026-08-20 19:29 UTCGHSA enrichment
  53. 2026-08-19 19:25 UTCEG score recompute
  54. 2026-08-19 19:25 UTCGHSA enrichment
  55. 2026-08-19 17:03 UTCEPSS rescore
  56. 2026-08-18 19:21 UTCEG score recompute
  57. 2026-08-18 19:21 UTCGHSA enrichment
  58. 2026-08-18 13:48 UTCEPSS rescore
  59. 2026-08-17 19:17 UTCEG score recompute
  60. 2026-08-17 19:17 UTCGHSA enrichment
  61. 2026-08-17 13:47 UTCEPSS rescore
  62. 2026-08-16 18:59 UTCEG score recompute
  63. 2026-08-16 18:59 UTCGHSA enrichment
  64. 2026-08-16 14:56 UTCEPSS rescore
  65. 2026-08-16 02:14 UTCEPSS rescore
  66. 2026-08-15 18:55 UTCEG score recompute
  67. 2026-08-15 18:55 UTCGHSA enrichment
  68. 2026-08-15 01:30 UTCEPSS rescore
  69. 2026-08-14 18:51 UTCEG score recompute
  70. 2026-08-14 18:51 UTCGHSA enrichment
  71. 2026-08-13 22:00 UTCEPSS rescore
  72. 2026-08-13 18:47 UTCGHSA enrichment
  73. 2026-08-12 18:43 UTCEG score recompute
  74. 2026-08-12 18:43 UTCGHSA enrichment
  75. 2026-08-12 13:50 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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 78.3% of all scored CVEs.
What is the CVSS score of CVE-2026-18638?
CVE-2026-18638 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-18638?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18638, 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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