Vulnerability · Published Sep 22, 2026 · Assigned by apache

CVE-2026-70410Apache Calcite Avatica: Unrestricted class initialization when instantiating plugins

High 8.8

In plain English

A high-severity security flaw in Apache Calcite Avatica from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.6%top 49.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Calcite Avatica. Plugin instantiation (via AvaticaUtils#instantiatePlugin and other methods) initializes arbitrary classes via unrestricted calls to Class.forName(String) which by default triggers initialization. This may lead to the execution of static initializer blocks in arbitrary classes present in the classpath. The instantiation APIs should initialize and instantiate only classes implementing the specified plugin interface passed as input in conjunction with the desired classname. At the moment of writing, there are no well-known or widely used classes with dangerous static initializer blocks so the severity is low. This issue affects Apache Calcite Avatica: before 1.29.0. Users are recommended to upgrade to version 1.29.0, which fixes the issue.

Affected products (as reported)

Vendor	Product	Versions
Apache Software Foundation	Apache Calcite Avatica	0 – before 1.29.0

Weakness: CWE-470 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://lists.apache.org/thread/07vwvsnbskhf5kvksn5t5l9qjozv2rk4 vendor-advisory