CVE-2023-6038: Local File Inclusion in h2oai/h2o-3

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-11-16 · updated 2026-06-17
Weakness: CWE-862

Description

A Local File Inclusion (LFI) vulnerability exists in the h2o-3 REST API, allowing unauthenticated remote attackers to read arbitrary files on the server with the permissions of the user running the h2o-3 instance. This issue affects the default installation and does not require user interaction. The vulnerability can be exploited by making specific GET or POST requests to the ImportFiles and ParseSetup endpoints, respectively. This issue was identified in version 3.40.0.4 of h2o-3.

Affected products

h2oai/h2o-3: all versions

References

https://huntr.com/bounties/380fce33-fec5-49d9-a101-12c972125d8c
https://huntr.com/bounties/380fce33-fec5-49d9-a101-12c972125d8c

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