CVE-2025-6544
A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.
- CVSS 3.0
- 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.9% chance of exploitation in the next 30 days; higher than 59% of CVEs (scores of 2026-10-25)
- CWE
- CWE-502
- Published
- Modified
- Record from
- the NVD, synced
Affected
- h2o:h2o
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5w3j-gwgh-4rfv | Maven | ai.h2o:h2o-core | <=3.46.0.7 | no fix published |
| GHSA-5w3j-gwgh-4rfv | PyPI | h2o | <=3.46.0.7 | no fix published |
| PYSEC-2026-349 | PyPI | h2o | <=3.46.0.7 | no fix published |