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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

H2O has an External Control of File Name or Path vulnerability

No fix yetCritical · CVSS 9.1EPSS 0.71%

Published Feb 2, 2026 · updated Oct 27, 2026

What to do

  1. Some affected packages have no fixed version yet: follow the advisory for mitigations and watch this page for the fix.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

Mavenai.h2o:h2o-core

Vulnerable versions
<= 3.46.0.1
Fixed in
no fix yet

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

PyPIh2o38,406 downloads/week

Vulnerable versions
<= 3.46.0.1
Fixed in
no fix yet

Check your project: pip show h2o

Sources

CWE-73 External Control of File Name or Path

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