PYSEC-2026-1446

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/h2o/PYSEC-2026-1446.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1446
Aliases
Published
2026-07-07T14:34:34.078190Z
Modified
2026-07-07T17:46:13.789733659Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
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.

References

Affected packages

PyPI / h2o

Package

Name
h2o
View open source insights on deps.dev
Purl
pkg:pypi/h2o

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Last affected
3.40.0.4

Affected versions

3.*
3.10.0.3
3.10.0.6
3.10.0.7
3.10.0.8
3.10.0.10
3.10.3.3
3.10.3.4
3.10.4.1
3.10.4.2
3.10.4.3
3.10.4.4
3.10.4.6
3.10.4.8
3.16.0.1
3.16.0.2
3.16.0.3
3.16.0.4
3.18.0.1
3.18.0.2
3.18.0.3
3.18.0.4
3.18.0.5
3.18.0.6
3.18.0.7
3.18.0.8
3.18.0.9
3.18.0.10
3.18.0.11
3.20.0.4
3.20.0.5
3.20.0.6
3.20.0.7
3.20.0.8
3.22.0.1
3.22.0.2
3.22.0.3
3.22.0.4
3.22.0.5
3.22.1.1
3.22.1.2
3.22.1.3
3.22.1.4
3.22.1.5
3.22.1.6
3.24.0.1
3.24.0.2
3.24.0.3
3.24.0.4
3.24.0.5
3.26.0.1
3.26.0.2
3.26.0.3
3.26.0.4
3.26.0.5
3.26.0.6
3.26.0.8
3.26.0.9
3.26.0.10
3.26.0.11
3.28.0.1
3.28.0.2
3.28.0.3
3.28.1.2
3.28.1.3
3.30.0.1
3.30.0.2
3.30.0.3
3.30.0.4
3.30.0.5
3.30.0.6
3.30.0.7
3.30.1.1
3.30.1.2
3.30.1.3
3.32.0.2
3.32.0.3
3.32.0.4
3.32.0.5
3.32.1.1
3.32.1.2
3.32.1.3
3.32.1.4
3.32.1.5
3.32.1.6
3.32.1.7
3.34.0.3
3.34.0.7
3.34.0.8
3.36.0.2
3.36.0.3
3.36.0.4
3.36.1.1
3.36.1.2
3.36.1.3
3.36.1.4
3.36.1.5
3.38.0.1
3.38.0.2
3.38.0.3
3.38.0.4
3.40.0.1
3.40.0.2
3.40.0.3
3.40.0.4

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/h2o/PYSEC-2026-1446.yaml"