Executive Summary

CVE-2026-21892 is a SQL Injection vulnerability in the Parsl Python parallel scripting library, specifically in the parsl-visualize component. The vulnerability occurs because the application constructs SQL queries using unsafe string formatting (Python % operator) with user-supplied input (workflow_id) taken directly from URL routes without sanitization or parameterization. This allows an unauthenticated attacker with access to the visualization dashboard to inject arbitrary SQL commands. The injected commands can manipulate the database queries, leading to unauthorized data access or disruption of service. [1]

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Impact Analysis

This vulnerability can impact you by allowing attackers to perform data exfiltration, accessing sensitive information such as environment variables, task parameters, and host information from the monitoring database. Attackers can also bypass access controls by injecting boolean logic to view unauthorized data. Additionally, they can cause denial of service by injecting resource-intensive or time-based queries that crash the visualization server or database. [1]

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Detection Guidance

This vulnerability can be detected by testing the parsl-visualize component's URL routes that accept the workflow_id parameter for SQL injection. One approach is to manipulate the workflow_id parameter in the URL with typical SQL injection payloads such as ' OR '1'='1 or UNION SELECT statements and observe the behavior of the visualization dashboard. For example, sending requests to URLs like /visualization/workflow/<workflow_id> with injected payloads and checking if the visualization graph disappears or reappears can indicate a Boolean-based blind SQL injection. Specific commands could include using curl or a web testing tool to send crafted HTTP requests with malicious workflow_id values and monitoring the responses or errors from the server. Example curl command: curl -v "http://<server>/visualization/workflow/' OR '1'='1". Additionally, monitoring logs for unusual SQL errors or unexpected query results can help detect exploitation attempts. [1]

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Mitigation Strategies

Immediate mitigation steps include upgrading to version 2026.01.05 of Parsl, which fixes the vulnerability by replacing unsafe string formatting with parameterized SQL queries using SQLAlchemy. If upgrading is not immediately possible, restrict access to the visualization dashboard to trusted users only, as the vulnerability requires access to this interface. Additionally, monitor and filter incoming requests to detect and block suspicious workflow_id inputs that may contain SQL injection payloads. Applying network-level controls or web application firewalls to limit exposure can also help reduce risk until the patch is applied. [2]

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Compliance Impact

The vulnerability allows unauthenticated attackers to perform SQL injection attacks that can lead to data exfiltration of sensitive information such as environment variables, task parameters, and host information from the monitoring database. This exposure of sensitive data could potentially violate compliance requirements under standards like GDPR and HIPAA, which mandate protection of personal and sensitive data. Therefore, the vulnerability poses a risk to compliance by enabling unauthorized access and potential leakage of sensitive data. [1]

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