MEDIUM5.3

PYSEC-2026-1446

Arbitrary system path lookup in h20

Details

In h2oai/h2o-3 version 3.40.0.4, an exposure of sensitive information vulnerability exists due to an arbitrary system path lookup feature. This vulnerability allows any remote user to view full paths in the entire file system where h2o-3 is hosted. Specifically, the issue resides in the Typeahead API call, which when requested with a typeahead lookup of '/', exposes the root filesystem including directories such as /home, /usr, /bin, among others. This vulnerability could allow attackers to explore the entire filesystem, and when combined with a Local File Inclusion (LFI) vulnerability, could make exploitation of the server trivial.

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Affected packages

PyPI/h2o

Introduced in: 0

No fixed version published yet for h2o (pip). Pin to a known-safe version or switch to an alternative.

References

https://nvd.nist.gov/vuln/detail/CVE-2024-5550[ADVISORY]
https://github.com/h2oai/h2o-3[PACKAGE]
https://huntr.com/bounties/e76372c2-39be-4984-a7c8-7048a75a25dc[WEB]
https://pypi.org/project/h2o[PACKAGE]
https://github.com/advisories/GHSA-x234-r5fg-x52m[ADVISORY]