CVE-2024-10549
HIGH7.5EPSS 0.34%H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint
Published: 3/20/2025Modified: 10/16/2025
Description
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.
Affected packages (2)
- Maven/ai.h2o:h2o-core>= 3.30.0.7, <= 3.46.0.1
- PyPI/h2o>= 3.30.0.7, <= 3.46.0.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |