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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

H2O Deserialization of Untrusted Data Vulnerability

Fix availableCritical · CVSS 9.8EPSS 1.6%

Published Mar 20, 2025 · updated Oct 27, 2026

What to do

  1. Upgrade to a fixed version: h2o 3.46.0.6, ai.h2o:h2o-core 3.46.0.6.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIh2o38,406 downloads/week

Vulnerable versions
< 3.46.0.6
Fixed in
3.46.0.6

Check your project: pip show h2o

Mavenai.h2o:h2o-core

Vulnerable versions
< 3.46.0.6
Fixed in
3.46.0.6

Check your project: mvn dependency:tree -Dincludes=ai.h2o:h2o-core

Sources

CWE-502 Deserialization of Untrusted Data

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