CVE-2026-25155 in qwik
Summary
by MITRE • 02/04/2026
Qwik is a performance focused javascript framework. Prior to version 1.12.0, a typo in the regular expression within isContentType causes incorrect parsing of certain Content-Type headers. This issue has been patched in version 1.12.0.
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Analysis
by VulDB Data Team • 02/11/2026
The vulnerability identified as CVE-2026-25155 affects the Qwik javascript framework, a performance-oriented web development library designed to optimize application loading and execution. This security flaw resides within the framework's content type handling mechanism, specifically in the isContentType function where a critical typo exists within a regular expression pattern. The issue impacts versions prior to 1.12.0, indicating that developers using older iterations of the framework may be exposed to potential security risks through improper header parsing. The vulnerability demonstrates a classic example of how seemingly minor code errors can lead to significant security implications in web applications.
The technical flaw manifests through a malformed regular expression that fails to properly validate Content-Type headers during HTTP request processing. When the isContentType function processes incoming requests, the typo causes the regular expression to incorrectly match or fail to match certain Content-Type values, potentially leading to improper content handling decisions. This parsing error creates a condition where malicious actors could manipulate HTTP headers to bypass content validation checks or cause unexpected behavior in the framework's request processing pipeline. The vulnerability represents a weakness in input validation and sanitization that could enable various attack vectors including content injection or request manipulation scenarios.
The operational impact of this vulnerability extends beyond simple parsing failures, as incorrect Content-Type header handling can compromise the security posture of applications built on the Qwik framework. Applications may inadvertently process requests with unexpected content types, potentially leading to injection attacks or bypassing security controls that depend on proper content type validation. This flaw could enable attackers to exploit the framework's request handling mechanisms, particularly in scenarios where content type validation is critical for security decisions. The vulnerability affects the framework's ability to properly distinguish between different types of content, potentially allowing unauthorized access or data manipulation through crafted HTTP requests.
The remediation for CVE-2026-25155 involves upgrading to Qwik version 1.12.0 or later, which contains the corrected regular expression within the isContentType function. This patch addresses the typo that was causing the incorrect parsing behavior and restores proper Content-Type header validation. Organizations should prioritize this upgrade as a critical security measure, particularly for applications handling sensitive data or operating in environments with high security requirements. The fix aligns with standard security practices for input validation and demonstrates the importance of thorough testing of regular expressions in security-critical code paths. This vulnerability serves as a reminder of how fundamental parsing logic errors can create security weaknesses that require careful attention to detail in code development and review processes.
This vulnerability type can be categorized under CWE-20 Improper Input Validation, which encompasses issues where applications fail to properly validate or sanitize input data. The flaw also relates to ATT&CK technique T1071.004 Application Layer Protocol: DNS, as improper content type handling can affect application layer protocols and request processing. The issue highlights the critical importance of regular expression testing and validation in security-sensitive code components, particularly in web frameworks where request handling forms the core security boundary for applications. Organizations should implement automated testing procedures that include regular expression validation to prevent similar issues from occurring in other framework components or custom code implementations.