CRITICAL9.3

PYSEC-2026-350

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

Quick fix

PYSEC-2026-350 — h2o: upgrade to the fixed version with the command below.

pip install --upgrade 'h2o>=3.46.0.1'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/h2o

Introduced in: 0Fixed in: 3.46.0.1

Fixpip install --upgrade 'h2o>=3.46.0.1'

References

https://nvd.nist.gov/vuln/detail/CVE-2023-6569[ADVISORY]
https://github.com/h2oai/h2o-3/commit/e8884f5187eb81311877c5f0dd4d6d9c70f33d78[WEB]
https://github.com/h2oai/h2o-3[PACKAGE]
https://huntr.com/bounties/a5d003dc-c23e-4c98-8dcf-35ba9252fa3c[WEB]
https://pypi.org/project/h2o[PACKAGE]
https://github.com/advisories/GHSA-gqrq-j6pm-98c2[ADVISORY]