Apache Calcite Avatica: Unrestricted class initialization when instantiating plugins (CVE-2026-70410) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-70410

Apache Calcite Avatica: Unrestricted class initialization when instantiating plugins

Answer in brief

CVE-2026-70410 records a Unknown severity vulnerability in Apache Calcite Avatica: Unrestricted class initialization when instantiating plugins. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Calcite Avatica (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Calcite Avatica (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/Apache Calcite Avaticageneric	>=0 <1.29.0	1.29.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Calcite Avatica.
Review the reported fix. Update Apache Software Foundation/Apache Calcite Avatica to 1.29.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Source referencelists.apache.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.