Amazon Redshift JDBC Driver Flaws Enable Remote Code Execution

Amazon Redshift users are facing a serious security risk after researchers uncovered a high-severity vulnerability that could allow attackers to execute arbitrary code on affected systems.

The flaw, tracked as CVE-2026-8178, affects the widely used Amazon Redshift JDBC Driver and raises urgent concerns for organizations relying on Java-based database connectivity.

Redshift JDBC Driver Flaw

The issue affects the Amazon Redshift JDBC Driver, which enables applications to connect to Redshift clusters using standard Java Database Connectivity (JDBC) APIs.

According to a GitHub security advisory (GHSA-wmmv-vvg5-993q), versions before 2.2.2 contain a critical flaw in how the driver processes connection parameters.

The vulnerability stems from unsafe class loading behavior. When the driver parses certain JDBC connection URL parameters, it may load arbitrary classes from the application’s classpath.

An attacker who can influence or control the JDBC connection URL can exploit this by crafting malicious parameter values, forcing the application to load and execute unintended classes already present in the environment.

Because the attack operates within the Java Virtual Machine (JVM) context, it requires no authentication or user interaction significantly raising its potential impact, especially in exposed or poorly secured deployments.

In a misconfigured application where connection strings are dynamically built or externally influenced, an attacker could inject a malicious parameter that triggers execution of harmful code packaged within the application’s own dependencies.

This makes the attack particularly dangerous in cloud-native environments where database connections are managed programmatically.

The vulnerability carries a high CVSS v3.1 score, impacting three critical dimensions:

• Confidentiality: Attackers may access sensitive data stored or processed by the application
• Integrity: Malicious code execution could alter application behavior or corrupt data
• Availability: Systems could be disrupted or crashed through active exploitation

No privileges or user interaction are required for exploitation, though specific environmental conditions must be present.

• Affected versions: Amazon Redshift JDBC Driver below 2.2.2
• Patched version: 2.2.2

AWS addressed the issue in version 2.2.2 and strongly urges all users to upgrade immediately. Organizations running forked or customized driver versions must also ensure patches are applied.

Recommended Mitigations

Security teams should take the following actions without delay:

• Upgrade to Amazon Redshift JDBC Driver version 2.2.2 or later
• Review how JDBC connection URLs are constructed, and block untrusted input from influencing them
• Audit application classpaths to identify potentially exploitable classes
• Monitor systems for unusual JVM behavior or unexpected code execution patterns

The vulnerability was responsibly disclosed with contributions from researcher Fushuling. AWS has encouraged users to report related concerns through its official security channels.

As attackers increasingly target application-layer weaknesses, this flaw underscores the risks of unsafe input handling in widely deployed database drivers.

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