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Vulnerability record · CVE-2025-6507 · published 1 September 2025

CVE-2025-6507: Deserialization of untrusted data vulnerability

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.

9.8 CVSS 3.0 Critical EPSS 14% · top 3.5% CWE-502 · Deserialization of untrusted data Deferred
9.8CVSS 3.0 base score
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

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

References

LinkTags
https://github.com/h2oai/h2o-3/commit/f714edd6b8429c7a7211b779b6ec108a95b7382d
https://huntr.com/bounties/0a9d527a-2d39-4bc0-bf01-1e717587f077

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Source: NIST National Vulnerability Database (record CVE-2025-6507), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.