CVE-2024-5550: h2o

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• h2o h2o: version 3.40.0.4 only

Published 2024-06-06. Last modified 2026-06-17.