CVE-2025-6507 CRITICAL

CVE-2025-6507: Deserialization of Untrusted Data in h2oai/h2o-3

Vendor H2Oai
Product h2oai/h2o-3
Weakness CWE-502 · Unsafe deserialization
Published September 1, 2025
Last update September 2, 2025

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

September 1, 2025 CVE published
September 2, 2025 Record updated