CVE-2026-106566 in ImageMagick
Summary
by MITRE • 10/07/2026
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to 7.1.2-32, delegate symlink cleanup does not check the MAGICK_SHRED_PASSES environment variable, allowing a local privileged workflow to overwrite a file with random data. This issue is fixed in version 7.1.2-32.
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Analysis
by VulDB Data Team • 10/07/2026
ImageMagick serves as a foundational toolset for digital image processing across numerous software ecosystems, handling tasks ranging from simple format conversions to complex algorithmic manipulations. The vulnerability identified prior to version 7.1.2-32 resides within the delegate cleanup mechanism, specifically affecting how symbolic links are handled during file operations. In many Linux and Unix-like environments, ImageMagick utilizes external delegates or internal routines to manage temporary files and intermediate data structures created during image processing workflows. When these processes conclude, they typically attempt to clean up by removing or securely erasing temporary artifacts to prevent information leakage or disk space exhaustion.
The core technical flaw involves the failure of the delegate symlink cleanup routine to respect the MAGICK_SHRED_PASSES environment variable. This environment variable is designed to specify the number of passes used when overwriting files with random data, a technique known as secure deletion or shredding. By ignoring this configuration setting during the cleanup phase for symbolic links, the software fails to perform the intended multi-pass overwrite operation. Instead, it may proceed with standard removal procedures or single-pass operations that do not meet the security expectations set by the administrator via the environment variable. This discrepancy creates a gap between the configured security policy and the actual operational behavior of the application when handling symlinks in privileged contexts.
From an offensive perspective, this flaw can be leveraged to achieve unintended file overwrites within local privileged workflows. An attacker with access to execute ImageMagick commands under elevated privileges could potentially manipulate symlink targets or exploit race conditions during the cleanup phase. Although the primary impact described is related to secure deletion integrity, the inability to properly shred files means that residual data may remain recoverable from disk storage after what was intended to be a secure erase operation. This undermines confidentiality guarantees for sensitive image data processed by privileged services such as web servers or batch processing systems that rely on ImageMagick for content transformation.
The operational impact extends beyond mere data recovery risks. In environments where strict compliance with data sanitization standards is required, this vulnerability represents a control failure. Organizations relying on automated pipelines to process user-uploaded images must ensure that temporary files are not left in recoverable states after processing completes. The lack of adherence to the MAGICK_SHRED_PASSES setting means that security controls intended to mitigate forensic analysis or unauthorized data reconstruction are effectively bypassed by default behavior when symlinks are involved. This is particularly critical in multi-tenant environments where one user's processed images might leave traces accessible to others if secure deletion fails.
Mitigation strategies primarily involve upgrading the ImageMagick installation to version 7.1.2-32 or later, which addresses this specific logic error in the delegate cleanup routine. Administrators should verify that their deployment pipelines are updated and test image processing workflows to ensure consistent behavior across different file types and link structures. Additionally, enforcing strict environment variable configurations remains important even after patching, as proper configuration ensures alignment between security policies and application execution. Monitoring logs for unusual symlink creation or modification events can also provide early detection of potential exploitation attempts targeting similar cleanup mechanisms in other components of the system.
This vulnerability aligns with CWE-200, which covers exposure of sensitive information to unauthorized actors due to improper data handling practices. It also relates to CWE-732, concerning incorrect permission assignment for critical resources, as the failure to properly shred files represents a deviation from expected security permissions regarding data lifecycle management. In terms of adversary tactics, this flaw could support ATT&CK technique T1564.008, Hidden Files and Directories, if an attacker uses symlinks to obscure malicious artifacts that are not securely removed during routine operations. Understanding these mappings helps in categorizing the risk within broader security frameworks and prioritizing remediation efforts based on industry-standard classifications of software weaknesses.