CVE-2011-10043 in Module::Load
Summary
by MITRE • 07/07/2026
Module::Load versions before 0.22 for Perl allow arbitrary modules outside of @INC to be loaded.
Module names starting with "::" could be passed to the load function to specify arbitrary module paths.
Attackers able to influence module names passed to load could use that bug to execute arbitrary code.
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Analysis
by VulDB Data Team • 07/07/2026
The vulnerability in Module::Load versions prior to 0.22 represents a critical security flaw that enables unauthorized code execution through improper module loading mechanisms. This issue stems from insufficient validation of module names passed to the load function, allowing attackers to manipulate the module resolution process and potentially load malicious code from arbitrary locations on the filesystem. The vulnerability specifically affects Perl applications that rely on Module::Load for dynamic module loading operations.
The technical flaw manifests when module names beginning with double colons "::" are processed by the load function. Under normal circumstances, Perl's module loading mechanism respects the @INC path array which defines valid directories for module searches. However, this vulnerability allows attackers to bypass these restrictions by crafting module names that specify absolute or relative paths directly, effectively circumventing the intended security boundaries of the module loading process. This behavior creates a path traversal-like condition within the module loading system where arbitrary file paths can be resolved and loaded.
The operational impact of this vulnerability is severe as it provides attackers with a direct pathway for remote code execution. When applications pass user-controlled input directly to Module::Load's load function without proper sanitization, an attacker can inject malicious module names that resolve to arbitrary files on the target system. This capability enables attackers to execute arbitrary Perl code with the privileges of the running application, potentially leading to complete system compromise. The vulnerability is particularly dangerous in web applications where user input might be processed through module loading functions.
This vulnerability maps to CWE-427 Uncontrolled Search Path Element and CWE-20 Improper Input Validation within the Common Weakness Enumeration framework. It also aligns with ATT&CK technique T1059.006 Command and Scripting Interpreter: Perl, as it enables attackers to execute malicious Perl code through legitimate system interfaces. The attack vector typically involves manipulating input parameters that eventually reach the load function, making it difficult to detect through standard security measures since the behavior appears legitimate from a functional standpoint.
The recommended mitigations include upgrading to Module::Load version 0.22 or later where proper validation has been implemented. Additionally, applications should never pass untrusted user input directly to the load function without thorough sanitization and validation. Implementing strict input filtering that rejects module names starting with "::" or containing potentially dangerous path characters is crucial. Organizations should also consider implementing application whitelisting controls and monitoring for unusual module loading patterns within their systems to detect potential exploitation attempts.