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.
Advisories
Source ID Title
EUVD EUVD EUVD-2025-7097 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.
Github GHSA Github GHSA GHSA-wwr9-4gmr-xvq9 H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 15 Oct 2025 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Wed, 15 Oct 2025 13:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1333

Mon, 14 Jul 2025 14:00:00 +0000

Type Values Removed Values Added
First Time appeared H2o
H2o h2o
CPEs cpe:2.3:a:h2o:h2o:3.46.0.1:*:*:*:*:*:*:*
Vendors & Products H2o
H2o h2o

Thu, 20 Mar 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 20 Mar 2025 10:15:00 +0000

Type Values Removed Values Added
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.
Title Denial of Service by ReDOS in h2oai/h2o-3
Weaknesses CWE-400
References
Metrics cvssV3_0

{'score': 7.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2025-10-15T12:49:27.711Z

Reserved: 2024-10-30T16:35:38.176Z

Link: CVE-2024-10549

cve-icon Vulnrichment

Updated: 2025-03-20T14:05:28.968Z

cve-icon NVD

Status : Modified

Published: 2025-03-20T10:15:17.263

Modified: 2025-10-15T13:15:35.860

Link: CVE-2024-10549

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.