CVE-2025-6507

critical · 9.8

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.

9.8

CVSS

13.7%

EPSS (exploit prob.)

96th

EPSS percentile

2025-09-01

Published

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

Weaknesses

CWE-502

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-6507