CVE-2026-62946 in ImageMagick
Summary
by MITRE • 07/30/2026
ImageMagick is free and open-source software used for editing and manipulating digital images. In versions prior to both 6.9.13-52 and 7.1.2-27, processing an extremely large JNX file on 32-bit platforms can cause an integer overflow, leading to a heap buffer over-write. This issue has been fixed in versions 6.9.13-52 and 7.1.2-27.
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Analysis
by VulDB Data Team • 07/30/2026
ImageMagick represents a widely deployed image processing library that handles numerous formats including JNX files through its native support for various digital imaging standards. The vulnerability occurs specifically within the JNX file format parser where input validation fails to properly handle excessively large file dimensions on 32-bit architectural platforms. This flaw manifests as an integer overflow condition when the software attempts to calculate memory allocation sizes based on malformed JNX file parameters, particularly affecting systems where pointer sizes are limited to 32 bits.
The technical implementation of this vulnerability stems from inadequate bounds checking within the image processing pipeline where dimension values from external JNX files are directly used to determine heap allocation sizes without proper overflow detection. When an attacker crafts a malicious JNX file containing oversized width or height parameters, the calculation routine performs arithmetic operations that exceed the maximum representable value for 32-bit signed integers, resulting in a wraparound condition that produces unexpectedly small memory allocation requests. This misalignment causes subsequent memory writes to overwrite adjacent heap regions, creating potential exploitation vectors for remote code execution or denial of service conditions.
The operational impact of this vulnerability extends across systems utilizing ImageMagick for automated image processing workflows, particularly in web applications and content management systems where user-uploaded files are processed without proper sanitization. Attackers can leverage this weakness by uploading specifically crafted JNX files that trigger the overflow condition during normal file parsing operations, potentially leading to system compromise or service disruption. The vulnerability affects both legacy 32-bit platforms and systems running 64-bit software with 32-bit compatibility layers, making it particularly dangerous in enterprise environments where mixed architecture support exists.
Security practitioners should implement immediate mitigations including deployment of patched ImageMagick versions 6.9.13-52 or 7.1.2-27 which contain proper input validation and integer overflow protection mechanisms. Additional defensive measures include implementing strict file format validation at ingestion points, employing sandboxed processing environments for image manipulation tasks, and establishing automated monitoring for unusual memory allocation patterns. The vulnerability aligns with CWE-190 Integer Overflow or Wraparound, a common weakness category that frequently appears in multimedia processing libraries, and maps to ATT&CK technique T1203 Exploitation for Client Execution when leveraged for remote code execution scenarios. Organizations should also consider implementing network-based intrusion detection systems capable of identifying malformed JNX file patterns and establishing comprehensive patch management procedures to address similar vulnerabilities in other image processing components within their infrastructure.