CVSS: 7.5EPSS: %CPEs: 1EXPL: 0CVE-2025-57804 – h2 allows HTTP Request Smuggling due to illegal characters in headers
https://notcve.org/view.php?id=CVE-2025-57804
25 Aug 2025 — h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls. This issue has been patched in version 4.3.0. • https://github.com/python-hyper/h2/security/advisories/GHSA-847f-9342-265h • CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') •
CVSS: 8.4EPSS: 0%CPEs: 1EXPL: 1CVE-2022-45868
https://notcve.org/view.php?id=CVE-2022-45868
23 Nov 2022 — The web-based admin console in H2 Database Engine before 2.2.220 can be started via the CLI with the argument -webAdminPassword, which allows the user to specify the password in cleartext for the web admin console. Consequently, a local user (or an attacker that has obtained local access through some means) would be able to discover the password by listing processes and their arguments. NOTE: the vendor states "This is not a vulnerability of H2 Console ... Passwords should never be passed on the command lin... • https://github.com/advisories/GHSA-22wj-vf5f-wrvj • CWE-312: Cleartext Storage of Sensitive Information •
CVSS: 10.0EPSS: 27%CPEs: 5EXPL: 4CVE-2022-23221 – h2: Loading of custom classes from remote servers through JNDI
https://notcve.org/view.php?id=CVE-2022-23221
19 Jan 2022 — H2 Console before 2.1.210 allows remote attackers to execute arbitrary code via a jdbc:h2:mem JDBC URL containing the IGNORE_UNKNOWN_SETTINGS=TRUE;FORBID_CREATION=FALSE;INIT=RUNSCRIPT substring, a different vulnerability than CVE-2021-42392. H2 Console versiones anteriores a 2.1.210, permite a atacantes remotos ejecutar código arbitrario por medio de una URL jdbc:h2:mem JDBC que contenga la subcadena IGNORE_UNKNOWN_SETTINGS=TRUE;FORBID_CREATION=FALSE;INIT=RUNSCRIPT, una vulnerabilidad diferente a CVE-2021-4... • https://packetstorm.news/files/id/165676 • CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') CWE-502: Deserialization of Untrusted Data •
CVSS: 10.0EPSS: 91%CPEs: 5EXPL: 3CVE-2021-42392 – h2: Remote Code Execution in Console
https://notcve.org/view.php?id=CVE-2021-42392
07 Jan 2022 — The org.h2.util.JdbcUtils.getConnection method of the H2 database takes as parameters the class name of the driver and URL of the database. An attacker may pass a JNDI driver name and a URL leading to a LDAP or RMI servers, causing remote code execution. This can be exploited through various attack vectors, most notably through the H2 Console which leads to unauthenticated remote code execution. El método org.h2.util.JdbcUtils.getConnection de la base de datos H2 toma como parámetros el nombre de la clase d... • https://github.com/cybersecurityworks553/CVE-2021-42392-Detect • CWE-502: Deserialization of Untrusted Data •
CVSS: 6.5EPSS: 6%CPEs: 1EXPL: 3CVE-2018-14335 – H2 Database 1.4.197 - Information Disclosure
https://notcve.org/view.php?id=CVE-2018-14335
24 Jul 2018 — An issue was discovered in H2 1.4.197. Insecure handling of permissions in the backup function allows attackers to read sensitive files (outside of their permissions) via a symlink to a fake database file. Se ha descubierto un problema en H2 1.4.197. La manipulación incorrecta de permisos en la función backup permite que los atacantes lean archivos sensibles (fuera de sus permisos) mediante un vínculo simbólico a un archivo falso de base de datos. Red Hat Data Grid is a distributed, in-memory, NoSQL datasto... • https://packetstorm.news/files/id/148745 • CWE-59: Improper Link Resolution Before File Access ('Link Following') CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-276: Incorrect Default Permissions •
CVSS: 8.8EPSS: 8%CPEs: 2EXPL: 1CVE-2018-10054
https://notcve.org/view.php?id=CVE-2018-10054
11 Apr 2018 — H2 1.4.197, as used in Datomic before 0.9.5697 and other products, allows remote code execution because CREATE ALIAS can execute arbitrary Java code. NOTE: the vendor's position is "h2 is not designed to be run outside of a secure environment." H2 1.4.197, tal y como se usa en Datomic en versiones anteriores a la 0.9.5697 y en otros productos, permite que se ejecute código de manera remota, ya que CREATE ALIAS puede ejecutar código Java arbitrario. • http://blog.datomic.com/2018/03/important-security-update.html • CWE-20: Improper Input Validation •