CVE-2026-8750

CVE-2026-8750 affects h2oai h2o-3 up to version 7402. The vulnerability lies in the ImportFile API’s ImportFile/PersistNFS.java importFiles() function, enabling remote information disclosure due to manipulation of file persistence. Multiple sources (NVD, Red Hat, CVE listings, and PT Security) de...

Deserialization Of Untrusted Data

h2o is vulnerable to Deserialization Of Untrusted Data. The vulnerability is due to improper handling of JDBC connection parameters with insufficient input validation, which allows an attacker to bypass regular expression checks using double URL encoding and subsequently read arbitrary files or...

EUVD-2025-7098

Malicious code in bioql PyPI...

EUVD-2025-30380

Malicious code in bioql PyPI...

Arbitrary File Overwrite

ai.h2o, h2o-core is vulnerable to Arbitrary File Overwrite. The vulnerability is due to a lack of export location restrictions in the model export endpoint, allowing an attacker to overwrite arbitrary files on the server...

Denial Of Service (DoS)

ai.h2o, h2o-core is vulnerable to Denial Of Service DoS. The vulnerability is due to the /3/Parse endpoint constructing a regular expression from a user-specified string, which is then applied to another user-specified string, allowing an attacker to send multiple simultaneous requests and exhaus...

H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request

A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a HEAD request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controll...

CVE-2024-45758

H2O.ai H2O through 3.46.0.4 allows attackers to arbitrarily set the JDBC URL, leading to deserialization attacks, file reads, and command execution. Exploitation can occur when an attacker has access to post to the ImportSQLTable URI with a JSON document containing a connectionurl property with a...

PT-2024-31754

Name of the Vulnerable Software and Affected Versions: H2O.ai H2O versions 3.46.0.4 and earlier Description: The issue allows attackers to arbitrarily set the JDBC URL, leading to deserialization attacks, file reads, and command execution. Exploitation can occur when an attacker has access to pos...

DSA-4508-1 h2o - security update

Bulletin has no description...

CVE-2016-4817

lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service use-after-free and application crash or possibly execute arbitrary code via a crafted packet...