AI and data stack advisories

Severe, 6 weeks1498Projects326

1498 severe, 6 weeks · 326 projects

H2O-3GHSA-wwr9-4gmr-xvq9

H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint

H2O-3

CVE-2024-10549 · Published Mar 20, 2025 · updated Jul 7, 2026

High7.5
No fix yet
GitHub advisory

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 versions

PackageAffectedFixed in
h2o
PyPI
>= 3.30.0.7, <= 3.46.0.1No fix yet
Details and references
CVSS 3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity from
GitHub (reviewed advisory)
Weakness
CWE-1333, CWE-400
Also known as
CVE-2024-10549, PYSEC-2026-1445

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