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Vulnerabilities

Vulnerability · CVE-2025-6507

A vulnerability in the h2oai/h2o-3 repository allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system f

Published Sep 1, 2025 · catalog updated Sep 2, 2025 · A vulnerability in the

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2025-6507 is not in CISA KEV. FIRST estimates a 16.94% chance of exploitation in the next 30 days. Check whether you run A vulnerability in the.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A vulnerability in the).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
16.94%
Remediation
Version ranges on file
Affected products
vendor h2oai h2oai/h2o-3 unspecified <3.46.0.8

A vulnerability in the h2oai/h2o-3 repository allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system files. This issue affects the latest master branch version 3.47.0.99999. The vulnerability arises from the ability to bypass regular expression filters intended to prevent malicious parameter injection in JDBC connections. Attackers can manipulate spaces between parameters to evade detection, allowing for unauthorized file access and code execution. The vulnerability is addressed in version 3.46.0.8.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor h2oai h2oai/h2o-3 unspecified <3.46.0.8unspecified <3.46.0.8

How to fix CVE-2025-6507

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-6507 is not in CISA KEV. FIRST estimates a 16.94% chance of exploitation in the next 30 days. Check whether you run A vulnerability in the.

Which versions are affected?

Compare what you have installed with h2oai h2oai/h2o-3 unspecified <3.46.0.8 unspecified <3.46.0.8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 16.94%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 1, 2025 · EUVD

    Detected

    A vulnerability in the h2oai/h2o-3 repository allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system files. This issue affects the latest master branch version 3.47.0.99999. The vulnerability arises from the ability to bypass regular expression filters intended to prevent malicious parameter injection in JDBC connections

  2. Sep 2, 2025 · EUVD

    Updated

    A vulnerability in the h2oai/h2o-3 repository allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system files. This issue affects the latest master branch version 3.47.0.99999. The vulnerability arises from the ability to bypass regular expression filters intended to prevent malicious parameter injection in JDBC connections

Sources

  • CVE.orgVulnerability recordCVE-2025-6507

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-6507

    30-day exploitation probability 16.94%

    first.org
  • EUVDVulnerability recordEUVD-2025-28743

    A vulnerability in the h2oai/h2o-3 repository allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system files. This issue affects the latest master branch version 3.47.0.99999. The vulnerability arises fro

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026