CVE-2026-74039

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (44th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Wazuh 4.0.0 before 4.14.7 and 5.0.0-beta2 contain a denial of service vulnerability that allows authenticated attackers with allow_run_as enabled to exhaust CPU resources by submitting arbitrarily deeply nested JSON structures to the POST /security/user/authenticate/run_as endpoint. Attackers can repeatedly submit malformed auth_context bodies with unlimited nesting depth to cause the API framework to consume excessive CPU, denying service to all other API consumers.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100CISA 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%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (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 18, 2026

Last Modified

October 1, 2026

Advisory Details (3)

Auto-updated Aug 18, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr.
generic

Wazuh 4.0.0 < 4.14.7 API DoS via Deeply Nested JSON auth_context | Advisories | VulnCheck

https://www.vulncheck.com/advisories/wazuh-api-dos-via-deeply-nested-json-auth-context
github_pr Patch Available

Improve API authentication stability and resource limits

Patch available: wazuh/wazuh v4.14.7 (PR #37034 merged 2026-07-07)

https://github.com/wazuh/wazuh/pull/37034
githubMentions a patch (unverified)🟡 PoC Available

Authenticated denial-of-service of the Wazuh API via `POST /security/user/authenticate/run_as` · Advisory · wazuh/wazuh · GitHub

https://github.com/wazuh/wazuh/security/advisories/GHSA-5vh8-34r8-q74q

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 46× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 21:39 UTCEG score recompute
  6. 2026-10-06 15:18 UTCEPSS rescore
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  17. 2026-09-29 15:24 UTCEPSS rescore
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  19. 2026-09-28 13:52 UTCEPSS rescore
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  21. 2026-09-27 13:48 UTCEPSS rescore
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  25. 2026-09-24 14:59 UTCEG score recompute
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  1. 2026-09-24 14:04 UTCEPSS rescore
  2. 2026-09-23 20:19 UTCEG score recompute
  3. 2026-09-23 17:54 UTCEPSS rescore
  4. 2026-09-22 20:25 UTCEG score recompute
  5. 2026-09-21 21:09 UTCEPSS rescore
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  7. 2026-09-20 20:16 UTCEPSS rescore
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  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-17 21:49 UTCEG score recompute
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  13. 2026-09-16 14:08 UTCEPSS rescore
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  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-13 22:14 UTCEG score recompute
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  19. 2026-09-12 15:02 UTCEPSS rescore
  20. 2026-09-11 23:50 UTCEG score recompute
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 00:38 UTCEG score recompute
  23. 2026-09-10 09:35 UTCEPSS rescore
  24. 2026-09-10 01:06 UTCEG score recompute
  25. 2026-09-08 22:01 UTCEPSS rescore
  26. 2026-09-08 04:44 UTCEG score recompute
  27. 2026-09-07 05:32 UTCEG score recompute
  28. 2026-09-06 13:48 UTCEPSS rescore
  29. 2026-09-06 06:19 UTCEG score recompute
  30. 2026-09-05 07:00 UTCEG score recompute
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  32. 2026-09-04 05:07 UTCEPSS rescore
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  34. 2026-09-02 14:12 UTCEPSS rescore
  35. 2026-09-02 08:38 UTCEG score recompute
  36. 2026-09-01 13:54 UTCEPSS rescore
  37. 2026-09-01 09:25 UTCEG score recompute
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-09-01 04:40 UTCEPSS rescore
  40. 2026-08-31 09:29 UTCEG score recompute
  41. 2026-08-30 19:18 UTCEPSS rescore
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  43. 2026-08-30 10:12 UTCEG score recompute
  44. 2026-08-30 01:22 UTCEPSS rescore
  45. 2026-08-29 11:00 UTCEG score recompute
  46. 2026-08-28 21:42 UTCEPSS rescore
  47. 2026-08-28 11:41 UTCEG score recompute
  48. 2026-08-27 14:25 UTCEPSS rescore
  49. 2026-08-27 12:29 UTCEG score recompute
  50. 2026-08-26 14:47 UTCEPSS rescore
  51. 2026-08-25 13:50 UTCEG score recompute
  52. 2026-08-25 13:49 UTCEPSS rescore
  53. 2026-08-24 14:36 UTCEG score recompute
  54. 2026-08-24 14:18 UTCEPSS rescore
  55. 2026-08-23 15:24 UTCEG score recompute
  56. 2026-08-23 00:19 UTCEPSS rescore
  57. 2026-08-22 16:12 UTCEG score recompute
  58. 2026-08-21 23:49 UTCEPSS rescore
  59. 2026-08-21 17:00 UTCEG score recompute
  60. 2026-08-20 22:56 UTCEPSS rescore
  61. 2026-08-19 18:36 UTCEG score recompute
  62. 2026-08-19 17:04 UTCEPSS rescore
  63. 2026-08-18 19:24 UTCEG score recompute
  64. 2026-08-18 19:05 UTCEG score recompute
  65. 2026-08-18 18:23 UTCEG score recompute
  66. 2026-08-18 17:40 UTCEG score recompute
  67. 2026-08-18 17:39 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-74039?
CVE-2026-74039 is a medium vulnerability published on August 18, 2026. Wazuh 4.0.0 before 4.14.7 and 5.0.0-beta2 contain a denial of service vulnerability that allows authenticated attackers with allowrunas enabled to exhaust CPU resources by submitting arbitrarily deeply nested JSON structures to the POST /security/user/authenticate/runas endpoint. Attackers can…
When was CVE-2026-74039 disclosed?
CVE-2026-74039 was first published on August 18, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74039 actively exploited?
CVE-2026-74039 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74039?
CVE-2026-74039 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-2026-74039?
A fix for CVE-2026-74039 is available: update to the fixed version the vendor names in its advisory.

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