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CVE-2023-6569 — External Control of File Name or Path in h2o — CVE...

CRITICAL

External Control of File Name or Path in h2oai/h2o-3

Published June 29, 2026Updated July 1, 2026Source: osv

Summary

Remote unauthenticated attackers can overwrite arbitrary server files with attacker-controllable data. The data that the attacker can control is not entirely arbitrary. h2o writes a CSV/XLS/etc file to disk, so the attacker data is wrapped in quotations and starts with "C1", if they're exporting as CSV.

Advisory Timeline

  • First published June 29, 2026 (105 days ago).
  • Last revised July 1, 2026 — 2 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update h2o to 3.46.0.1 or later
pip install "h2o>=3.46.0.1"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
h2o
pypi
3.10.0.10, 3.10.0.3, 3.10.0.6, 3.10.0.7 (+107 more)3.46.0.1

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.3 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

References

Frequently Asked Questions

What is CVE-2023-6569?
External Control of File Name or Path in h2oai/h2o-3 This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.3/10).
How do I check if my project is affected by CVE-2023-6569?
CVE-2023-6569 affects h2o. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2023-6569 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.3

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

PYSEC-2026-350
GHSA-gqrq-j6pm-98c2

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