CVE-2025-6507: Deserialization of Untrusted Data in h2oai/h2o-3
Vulnerability summary
CVE-2025-6507 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in h2oai h2oai/h2o-3. EPSS estimates a 17.27% chance of exploitation in the next 30 days, higher than 97.1% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 17% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Timeline
- 01-09-2025PublishedVulnerability first disclosed.
- 02-09-2025Last modifiedVulnerability information updated.
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 metrics
2 scores · 2 sources · 1 version- NVDNIST9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
17.27%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
Increase +2.88 pp
From 14.38% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
H2oai1 product
- h2oai/h2o-3≥ unspecified, < 3.46.0.8
1 vendor · 1 product