HIGH7.5
PYSEC-2026-1445
H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint
Details
A vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.
Are you affected?
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Affected packages
PyPI/h2o
Introduced in:
3.30.0.7No 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-2024-10549[ADVISORY]
- https://github.com/h2oai/h2o-3[PACKAGE]
- https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseHandler.java#L80[WEB]
- https://huntr.com/bounties/ce7bd2d6-fd38-440d-a91a-dd8f3fc06bc2[WEB]
- https://pypi.org/project/h2o[PACKAGE]
- https://github.com/advisories/GHSA-wwr9-4gmr-xvq9[ADVISORY]