Description
A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint applies a user-specified regular expression to a user-controllable string. This can be exploited by an attacker to cause inefficient regular expression complexity, leading to the exhaustion of server resources and making the server unresponsive.
Scores
CVSS v3
7.5
EPSS
0.0045
EPSS Percentile
63.8%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-1333
Status
published
Products (3)
ai.h2o/h2o-core
3.30.0.7Maven
h2o/h2o
3.46.0.1
pypi/h2o
3.30.0.7PyPI
Published
Mar 20, 2025
Tracked Since
Feb 18, 2026