CVE-2026-7018: Datavane Datavines Auth Bypass Vulnerability

CVE-2026-7018 Overview

A hard-coded cryptographic key vulnerability has been identified in Datavane Datavines, specifically within the JWT Token Handler component. The vulnerability exists in the file datavines-core/src/main/java/io/datavines/core/utils/TokenManager.java, where manipulation of the tokenSecret argument can lead to the use of a hard-coded cryptographic key. This weakness allows remote attackers to potentially forge or manipulate JWT tokens, compromising the authentication integrity of affected systems.

Critical Impact
The use of hard-coded cryptographic keys in JWT token management can enable attackers to bypass authentication mechanisms, forge valid tokens, and gain unauthorized access to protected resources.

Affected Products

Datavane Datavines (versions up to commit 13607645e14a4982468cfdbcf75c85cde63bae71)

Discovery Timeline

2026-04-26 - CVE CVE-2026-7018 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-7018

Vulnerability Analysis

This vulnerability falls under CWE-320 (Key Management Errors) and represents a significant cryptographic weakness in the Datavines data quality platform. The JWT Token Handler in TokenManager.java utilizes a hard-coded cryptographic key for token generation and validation. When cryptographic secrets are embedded directly in source code, they become accessible to anyone with access to the codebase, including through reverse engineering or source code disclosure.

The attack requires network access but is described as having high complexity, making exploitation difficult but not impossible. The vulnerability has been publicly disclosed through the project's issue tracker and a corresponding pull request has been submitted to address the issue.

Root Cause

The root cause of this vulnerability is improper key management practices in the TokenManager.java component. Instead of deriving the tokenSecret from a secure external configuration source or environment variables, the application uses a hard-coded value embedded in the source code. This violates fundamental cryptographic security principles, as the secret key should never be predictable or accessible through code inspection.

Attack Vector

The attack vector is network-based, allowing remote exploitation without requiring user interaction. An attacker could exploit this vulnerability by:

Obtaining the hard-coded tokenSecret value from the publicly accessible source code repository
Using the discovered secret to forge valid JWT tokens
Leveraging the forged tokens to authenticate as arbitrary users or gain elevated privileges

The exploitation is described as difficult due to the high attack complexity required. However, since the exploit has been publicly disclosed, the technical details are available to potential attackers.

The vulnerability mechanism involves the tokenSecret parameter in the JWT Token Handler. When this secret is hard-coded, any individual with access to the source code can extract it and use it to sign arbitrary JWT tokens that the application will accept as valid. For technical details, see the GitHub Issue Discussion and the proposed patch.

Detection Methods for CVE-2026-7018

Indicators of Compromise

Unusual JWT token patterns or tokens with unexpected claims appearing in application logs
Authentication events from unknown or unexpected source IPs using valid tokens
Multiple authentication attempts with tokens signed using the compromised secret
Anomalous access to protected resources by users with forged authentication tokens

Detection Strategies

Audit source code for hard-coded secrets using static analysis tools such as GitLeaks, TruffleHog, or similar secret scanning utilities
Monitor authentication logs for tokens with suspicious creation timestamps or anomalous claim values
Implement JWT token introspection to detect tokens created outside normal application flows
Deploy application-level monitoring to identify authentication bypass attempts

Monitoring Recommendations

Enable detailed logging for all JWT token validation operations in the Datavines application
Configure alerts for authentication failures followed by successful authentications from the same source
Monitor repository access and audit logs for unauthorized code access that could expose the hard-coded secret
Implement real-time security monitoring for abnormal token usage patterns

How to Mitigate CVE-2026-7018

Immediate Actions Required

Apply the patch identified by commit e540d6dc04e2e6ad11907fb655f3728a13e7b939 to remediate the hard-coded key vulnerability
Rotate all JWT secrets immediately after patching to invalidate any tokens signed with the compromised key
Review authentication logs for signs of exploitation or unauthorized access
Audit your Datavines deployment for any sensitive data that may have been accessed using forged tokens

Patch Information

A patch is available through GitHub Pull Request #579 with commit hash e540d6dc04e2e6ad11907fb655f3728a13e7b939. Note that Datavane Datavines implements a rolling release model, so traditional version information is not available. Organizations should ensure they have applied commits beyond the patch commit to receive the fix. The project maintainers were informed of the issue through the pull request but have not yet officially responded.

Workarounds

Configure the tokenSecret through environment variables or external secure configuration management systems instead of relying on the hard-coded value
Implement additional authentication layers (such as IP whitelisting or multi-factor authentication) to reduce the impact of potential token forgery
Restrict network access to the Datavines application to trusted sources only
Consider deploying a web application firewall (WAF) with rules to detect and block suspicious authentication patterns

bash

# Configuration example
# Set JWT token secret via environment variable instead of hard-coded value
export DATAVINES_TOKEN_SECRET="$(openssl rand -base64 32)"

# Alternatively, use a secrets management solution
# Example with HashiCorp Vault:
# export DATAVINES_TOKEN_SECRET=$(vault kv get -field=token_secret secret/datavines)