A critical-severity remote code execution vulnerability, tracked as CVE-2026-8178, has been disclosed in the Amazon Redshift JDBC Driver, affecting all versions before 2.2.2.
Researchers warn that attackers who can manipulate a JDBC connection URL can silently trigger arbitrary class loading and execute malicious code within a live application’s Java Virtual Machine (JVM), putting sensitive cloud data workloads at immediate risk.
The Amazon Redshift JDBC Driver (com.amazon.redshift:redshift-jdbc42) is a Type 4 JDBC driver that enables Java applications to connect to Amazon Redshift data warehouses via standard JDBC APIs.
A security flaw, formally assigned CVE-2026-8178 and published to the NVD on May 8, 2026, was found lurking in how the driver processes certain JDBC connection URL parameters.
Instead of safely parsing and validating these parameters, vulnerable versions of the driver pass them through a mechanism that can trigger class loading from the application’s existing classpath, a technique security researchers categorize under CWE-470: Use of Externally-Controlled Input to Select Classes or Code (‘Unsafe Reflection’) .
The security advisory, GHSA-wmmv-vvg5-993q, was published through GitHub’s coordinated disclosure program and credited to independent researcher Fushuling, who responsibly reported the flaw to AWS Security. Amazon acknowledged the report and quietly shipped a patched release before public disclosure.
Amazon Redshift JDBC Vulnerability
The mechanism exploits a deceptively simple attack surface: the JDBC connection URL. In enterprise Java applications, JDBC URLs are often dynamically assembled from configuration files, environment variables, application properties, or even user-supplied inputs in multi-tenant systems.
If an attacker can influence any component of the URL passed to the Redshift JDBC driver, they can embed a specially crafted parameter value that causes the driver to invoke Java’s class loading mechanism in an unsafe manner.
Once the malicious class is loaded from the application’s classpath, execution occurs in the context of the running JVM, meaning it inherits all the privileges, credentials, environment variables, and memory access of the hosting application. This is what makes the vulnerability particularly insidious: no separate payload-delivery is required.
The attacker simply needs a class already present on the classpath to serve as a “gadget” to chain into code execution, a technique closely mirrored by the infamous Log4Shell vulnerability’s JNDI class-loading chain. Crucially, the attack requires no authentication or user interaction, making it remotely exploitable under the right conditions.
Amazon’s CNA (Common Numbering Authority) scored the vulnerability at 9.2 CRITICAL under CVSS 4.0, reflecting both its high impact and the network-reachable attack vector. Under CVSS 3.1, the advisory carries a High rating with the following vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
| CVSS Metric | Value |
|---|---|
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Confidentiality Impact | High |
| Integrity Impact | High |
| Availability Impact | High |
| CVSS 3.1 Rating | High |
| CVSS 4.0 Score | 9.2 Critical |
Any Java application that uses the com.amazon.redshift:redshift-jdbc42 Maven packages with a version below 2.2.2 are directly affected. This spans a wide spectrum of enterprise deployments: data engineering pipelines, BI tool backends, ETL frameworks, microservices with Redshift integrations, and Spring Boot or Jakarta EE applications connecting to AWS data warehouses.
The risk is compounded in multi-tenant SaaS environments, where one tenant’s ability to influence connection parameters could allow cross-tenant code execution within a shared JVM. Organizations running forked or derivative versions of the driver a common practice in large enterprise builds are also at risk even if the base package version appears patched.
Patch and Remediation
Amazon released Amazon Redshift JDBC Driver version 2.2.2 as the official fix and strongly recommends all users upgrade immediately. The patched version eliminates the unsafe class loading behavior by enforcing strict validation and sanitization of connection URL parameter values before they are processed.
AWS published a corresponding security bulletin at aws.amazon.com/security/security-bulletins/2026-028-aws/ and has directed organizations with questions to reach out via aws-security@amazon.com or the AWS vulnerability reporting portal.
For organizations unable to patch immediately, security teams should:
- Audit all JDBC connection URLs within the application stack for user-influenced or externally-sourced parameters
- Enforce strict input validation on any data path that can reach the JDBC configuration
- Restrict classpath exposure, minimize the number of classes available to the application JVM
- Monitor JVM process activity for unexpected class loading events or anomalous outbound connections
- Review forked or derivative driver code to ensure the fix is incorporated in custom builds
This disclosure arrives amid a wave of JDBC driver vulnerabilities targeting Java-based data infrastructure. In early 2024, CVE-2024-1597, a critical SQL injection flaw in the PostgreSQL JDBC driver, demonstrated that database connectivity layers can serve as a direct entry point for attackers.
Similarly, research published pyn3rd on JDBC attack vectors showed that connection URL manipulation is an underexplored but potent attack class in Java ecosystems.
CVE-2026-8178 follows the same attack philosophy: trusting externally supplied driver parameters without sufficient controls. This signals that JDBC driver security needs to be treated as a first-class concern in cloud-native security reviews.
FAQ
Q1. What is CVE-2026-8178?
CVE-2026-8178 is a high-severity remote code execution vulnerability in the Amazon Redshift JDBC Driver (versions before 2.2.2) that allows attackers to load and execute arbitrary classes via manipulated JDBC connection URL parameters.
Q2. Which versions of the Amazon Redshift JDBC Driver are affected?
All versions of com.amazon.redshift:redshift-jdbc42 below 2.2.2 are vulnerable; upgrading to version 2.2.2 or later fully resolves the issue.
Q3. Does exploiting CVE-2026-8178 require authentication?
No, the vulnerability requires zero privileges and zero user interaction, though it does require the attacker to influence the JDBC connection URL, which raises the attack complexity to “High”.
Q4. How can organizations protect themselves right now?
Immediately upgrade to Amazon Redshift JDBC Driver version 2.2.2, validate all JDBC URL inputs, restrict the application’s JVM classpath, and review any forked or customized driver code to ensure the patch is applied.
Site: thecybrdef.com
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