CVE-2026-72814 in actix-files
Summary
by MITRE • 08/14/2026
The actix-files crate (actix_files) before version 0.6.10 contains an information exposure vulnerability. When a non-existing folder is passed as the serve_from argument to Files::new(), the mount path defaults to an empty path; the service then joins the request path with this empty path and canonicalizes it, causing Rust to resolve it as a relative path. As a result, an attacker can request paths that resolve relative to the application's working directory and access unintended files.
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Analysis
by VulDB Data Team • 08/14/2026
The actix-files crate vulnerability represents a critical information exposure flaw that undermines application security through improper path handling mechanisms. This vulnerability affects versions prior to 0.6.10 and stems from how the Files::new() function processes non-existing folder paths when used as the serve_from argument. The core issue manifests when developers pass directory paths that do not exist within their application's file system structure, creating a scenario where the mount path defaults to an empty string value rather than properly validating or rejecting invalid inputs.
The technical implementation of this flaw occurs through a series of cascading operations that begin with the service's handling of the empty mount path. When the application encounters a request for a non-existent folder, the system joins the requested path with this empty mount path, effectively creating a relative path resolution scenario. The Rust runtime then canonicalizes this constructed path, which causes the operating system to interpret the request as relative to the application's current working directory rather than maintaining proper isolation within the intended file serving context. This behavior creates an unexpected attack surface where malicious actors can traverse the file system beyond the intended boundaries of the application's designated serving directories.
The operational impact of this vulnerability extends far beyond simple information disclosure, representing a fundamental breakdown in application security boundaries that could enable attackers to access sensitive files, configuration data, or system resources. The relative path resolution mechanism allows adversaries to craft requests that bypass normal directory restrictions, potentially exposing database connection strings, API keys, private certificates, or other confidential artifacts stored within the application's working directory. This vulnerability directly violates security principles of least privilege and proper access control, as it enables unauthorized file system traversal through seemingly benign API usage patterns.
This vulnerability maps directly to CWE-22 known as "Improper Limitation of a Pathname to a Restricted Directory" and aligns with ATT&CK technique T1083 "File and Directory Discovery" by enabling attackers to enumerate system files through crafted path requests. The flaw demonstrates poor input validation and inadequate path sanitization practices that are common in web application frameworks when dealing with dynamic file serving configurations. Organizations using affected versions of actix-files should implement immediate mitigations including upgrading to version 0.6.10 or later, implementing additional path validation logic within their applications, and conducting thorough security reviews of all file serving endpoints to ensure proper directory isolation and access controls.
The remediation approach requires developers to validate all serve_from arguments before passing them to Files::new() functions, ensuring that only existing directories are accepted as valid mount points. Additionally, explicit path canonicalization checks should be implemented to prevent any scenario where empty or null path components could result in relative path resolution. Security teams should also consider implementing network-based monitoring to detect unusual file system access patterns that might indicate exploitation attempts of this vulnerability. The fix demonstrates the importance of defensive programming practices and proper error handling in security-critical components, particularly those dealing with file system operations where path traversal attacks remain a persistent threat vector in modern web applications.