CVE-2026-21764 in DevOps Loop
Summary
by MITRE • 07/17/2026
HCL DevOps Loop is affected by insufficient input validation that allows special characters where they should be restricted. This may result in unintended application behavior under certain conditions.
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Analysis
by VulDB Data Team • 07/17/2026
The vulnerability in HCL DevOps Loop represents a critical input validation weakness that falls under the CWE-20 category of improper input validation. This flaw allows malicious actors to inject special characters into input fields where such characters should be strictly prohibited, creating potential pathways for exploitation. The issue manifests when the system fails to properly sanitize or restrict user-supplied data, particularly in contexts where specific character sets are expected for security reasons.
The technical implementation of this vulnerability stems from inadequate filtering mechanisms within the DevOps platform's input processing layers. When special characters such as semicolons, ampersands, or other control characters are permitted through validation checks, they can potentially be interpreted by underlying systems or applications in unintended ways. This behavior creates opportunities for command injection attacks, where malicious inputs could execute arbitrary commands on the system. The vulnerability particularly affects areas where user input is directly processed without proper sanitization, such as configuration parameters, script inputs, or environment variable settings within the DevOps pipeline.
From an operational perspective, this weakness can lead to significant security implications across the software development lifecycle. Attackers may exploit this flaw to manipulate build processes, inject malicious code into deployment pipelines, or gain unauthorized access to sensitive system resources. The impact extends beyond simple data corruption as it can compromise the integrity of entire DevOps workflows and potentially provide attackers with persistent access to development environments. This vulnerability particularly threatens continuous integration and delivery systems where automated processes rely on trusted input data.
The attack surface for this vulnerability aligns with several ATT&CK techniques including T1059 for command and scripting interpreter and T1203 for exploitation for privilege escalation. Organizations should implement comprehensive input validation controls that enforce strict character set restrictions and employ proper sanitization routines before any user-provided data is processed. Recommended mitigations include implementing robust regular expression patterns to validate input fields, deploying web application firewalls with content filtering capabilities, and conducting thorough code reviews to identify all input processing points that may be vulnerable to similar attacks. Additionally, organizations should establish automated testing procedures that specifically target input validation scenarios to prevent such issues from reaching production environments.
The remediation approach should focus on strengthening the core validation logic within HCL DevOps Loop while ensuring that all user-supplied inputs undergo rigorous sanitization before being processed by any system components. This includes implementing defense-in-depth strategies that combine multiple layers of protection including proper access controls, input encoding mechanisms, and runtime monitoring to detect anomalous behavior patterns that might indicate exploitation attempts. Regular security assessments and penetration testing should be conducted to verify the effectiveness of implemented controls and identify additional areas where similar vulnerabilities may exist within the broader DevOps ecosystem.