GHSA-5w3j-gwgh-4rfv · Severity: critical · Ecosystem: maven — H2O affected by a deserialization vulnerability
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.
Conclusion & alert: CVE-2025-6544 is rated High Exploit Risk (78.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.57%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-27 | 0.47% | 0.57% | +0.10% |
| 2 | 2026-04-17 | 0.42% | 0.47% | +0.05% |
| 3 | 2026-03-01 | — | 0.42% | — |
Full EPSS history (8 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.8 | 3.0 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
GHSA-5w3j-gwgh-4rfv · Severity: critical · Ecosystem: maven — H2O affected by a deserialization vulnerability
| URL | Tags |
|---|---|
| https://github.com/h2oai/h2o-3/commit/0298ee348f5c73673b7b542158081e79605f5f25 | Patch |
| https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40 | Exploit Third Party Advisory |