CVE-2025-6507 Deserialization of Untrusted Data in h2oai/h2o-3
Attackers can bypass JDBC parameter filters to trigger deserialization, leading to arbitrary code execution and system file access in H2O-3.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-6507?
CVE-2025-6507 is a critical unsafe deserialization vulnerability in h2oai/h2o-3, published on 1 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2025-6507?
How do I fix CVE-2025-6507?
No fix has been published for CVE-2025-6507 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-6507 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6507 exists.