CVE-2026-3960

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 42% of all CVEs by exploit prediction. 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, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
56.9%
KEV
Not listed

Published

April 23, 2026

Last Modified

May 19, 2026

Advisory Details (2)

Auto-updated Jun 21, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

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https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d
github_commit

commit b9ae2d3c5220 (h2oai/h2o-3)

Fix landed in h2oai/h2o-3 commit b9ae2d3c5220 — awaiting tagged release

https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
ai.h2o:h2o-core0.1.10 ... 3.8.3.4 (255 versions)3.46.0.10—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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 142 total refreshes for this CVE.

  1. 2026-07-16 17:03 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-25 13:49 UTCEPSS rescore
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  15. 2026-06-15 06:45 UTCEG score recompute
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  20. 2026-06-13 23:00 UTCEPSS rescore
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  23. 2026-06-12 12:36 UTCEG score recompute
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  35. 2026-06-10 12:18 UTCEG score recompute
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  43. 2026-06-08 14:17 UTCEPSS rescore
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  45. 2026-06-08 13:23 UTCEG score recompute
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  51. 2026-06-07 15:25 UTCEPSS rescore
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  59. 2026-06-06 13:47 UTCEPSS rescore
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  61. 2026-06-06 13:18 UTCEG score recompute
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  65. 2026-06-05 22:47 UTCEPSS rescore
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  67. 2026-06-05 20:37 UTCEG score recompute
  68. 2026-06-05 16:31 UTCEG score recompute
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  71. 2026-06-05 06:10 UTCEPSS rescore
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  73. 2026-06-05 03:07 UTCEG score recompute
  74. 2026-06-04 20:54 UTCEG score recompute
  75. 2026-06-04 16:48 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-3960?
CVE-2026-3960 is a critical vulnerability published on April 23, 2026. A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific…
When was CVE-2026-3960 disclosed?
CVE-2026-3960 was first published in the National Vulnerability Database on April 23, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3960 actively exploited?
CVE-2026-3960 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 56.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-3960?
CVE-2026-3960 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-3960?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3960, 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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