CVE-2026-18632 in dify
Summary
by MITRE • 08/03/2026
A security flaw has been discovered in langgenius dify up to 1.14.2. This issue affects the function jinja2.Template of the file api/core/helper/code_executor/jinja2/jinja2_transformer.py of the component Jinja2 Handler. The manipulation results in improper neutralization of special elements used in a template engine. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 08/03/2026
This vulnerability exists within the langgenius dify application version 1.14.2 and earlier, specifically targeting the jinja2.Template function located in api/core/helper/code_executor/jinja2/jinja2_transformer.py. The flaw represents a critical security issue that allows attackers to exploit improper neutralization of special elements within the template engine, creating potential for remote code execution and arbitrary code injection attacks. The vulnerability stems from insufficient sanitization of user input before processing through the Jinja2 templating system, which is commonly used for generating dynamic content in web applications.
The technical implementation of this flaw occurs when the application processes template data without adequate validation or escaping of special characters that have significance within the Jinja2 template syntax. This creates an environment where malicious actors can inject template code that gets executed during rendering, potentially leading to complete system compromise. The vulnerability manifests through the Jinja2 Handler component's inability to properly sanitize input parameters, allowing attackers to manipulate the template engine's behavior through crafted payloads that exploit the underlying template processing logic.
From an operational perspective, this vulnerability poses significant risks to organizations using affected versions of langgenius dify as it enables remote exploitation without requiring authentication. Attackers can leverage publicly available exploits to inject malicious code that may result in data exfiltration, system compromise, or further lateral movement within network environments. The impact extends beyond simple code injection as the compromised application could serve as a foothold for more extensive attacks, potentially affecting connected systems and databases that rely on the vulnerable template processing functionality.
The vulnerability aligns with CWE-74 and CWE-94 categories from the Common Weakness Enumeration catalog, specifically addressing improper neutralization of special elements used in template engines and code injection flaws respectively. According to MITRE ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: Python) and T1203 (Exploitation for Client Execution), as attackers can leverage the compromised template engine to execute arbitrary commands on the target system. Organizations should prioritize immediate mitigation through patch updates or implementation of input validation controls, as the public availability of exploitation tools increases the risk profile significantly.
Security organizations should implement network segmentation and monitoring of template processing endpoints to detect potential exploitation attempts. The lack of vendor response to early disclosure highlights the urgency for organizations to maintain independent vulnerability assessment capabilities and develop incident response procedures for unpatched vulnerabilities. Additional defensive measures include implementing web application firewalls, restricting external access to affected components, and conducting comprehensive code reviews to identify similar template processing patterns that may present equivalent risks across the application stack.