CVE-2026-28688 in ImageMagick
Summary
by MITRE • 03/10/2026
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-16 and 6.9.13-41, a heap-use-after-free vulnerability exists in the MSL encoder, where a cloned image is destroyed twice. The MSL coder does not support writing MSL so the write capability has been removed. This vulnerability is fixed in 7.1.2-16 and 6.9.13-41.
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Analysis
by VulDB Data Team • 04/22/2026
The vulnerability identified as CVE-2026-28688 represents a critical heap-use-after-free flaw within ImageMagick's MSL encoder implementation. This security weakness affects versions prior to 7.1.2-16 and 6.9.13-41 of the widely-used image processing software. ImageMagick serves as a fundamental component in numerous digital workflows across web applications, content management systems, and image processing pipelines, making this vulnerability particularly concerning for organizations relying on its functionality. The flaw manifests specifically within the MSL (Magick Scripting Language) coder module where improper memory management leads to dangerous heap corruption conditions. The technical root cause involves a scenario where a cloned image object undergoes destruction twice, creating a use-after-free condition that can be exploited by malicious actors to execute arbitrary code or cause application crashes.
The operational impact of this vulnerability extends beyond simple application instability, as it provides potential attackers with pathways for remote code execution within systems that process untrusted image files. When ImageMagick processes MSL formatted images, the double destruction of cloned objects leaves freed memory regions in an inconsistent state, allowing attackers to manipulate heap contents and potentially redirect execution flow. This vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in memory management, and demonstrates how improper object lifecycle management can create exploitable conditions. The attack surface is particularly broad given ImageMagick's integration into web servers, automated image processing systems, and content delivery networks where users might upload or download image files without proper sanitization.
Security researchers have identified that the MSL coder's write capability was completely removed in the patched versions, effectively eliminating the attack vector by preventing the creation of malformed MSL content that could trigger the heap corruption. This remediation approach addresses the root cause by removing the vulnerable functionality entirely rather than attempting to fix the memory management issue, which aligns with defensive programming principles. Organizations should prioritize immediate patching of affected systems, as the vulnerability can be exploited through simple image file uploads in web applications. The fix implemented in versions 7.1.2-16 and 6.9.13-41 demonstrates a proactive approach to vulnerability remediation by completely disabling the problematic code path rather than applying partial fixes that might leave residual risks. System administrators should also implement additional security controls such as file type validation, sandboxed processing environments, and regular security audits to further mitigate potential exploitation attempts.
The broader implications of this vulnerability highlight the importance of comprehensive memory safety testing in image processing libraries and the critical need for regular security updates in widely-deployed software components. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and code execution techniques, as attackers can leverage use-after-free conditions to gain unauthorized system access. Organizations should also consider implementing network segmentation, input validation, and monitoring for suspicious file processing activities to detect potential exploitation attempts. The vulnerability serves as a reminder of the critical security considerations when handling multimedia file formats in applications, particularly in environments where user uploads are permitted without proper sanitization.