CVE-2025-6544CRITICAL 9.8EPSS p53.0%

CVE-2025-6544CVE-2025-6544

Description

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.

Scoring

CVSS 3.09.8 (CRITICAL)
VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.84% probability of exploitation · percentile 53.0% · 2026-06-19T12:03:05Z
Published2025-09-21
Last modified2025-10-08

Underlying weaknesses· 1

CWE-502

References

  1. https://github.com/h2oai/h2o-3/commit/0298ee348f5c73673b7b542158081e79605f5f25
  2. https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40
  3. https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40

1

TypeTargetConfidenceTier
WeaknessDeserialization of Untrusted Datacwe-5020%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.