CVE-2026-62343: 
C# vulnerability analysis and mitigation

CVE-2026-62343 is a heap buffer over-write vulnerability in ImageMagick triggered during a morphology operation when an invalid, user-supplied kernel is provided. It was reported by researcher Kwstubbs, first published as a security advisory on July 14, 2026, and added to the GitHub Advisory Database on July 24, 2026. Affected software includes ImageMagick versions prior to 7.1.2-26 and 6.9.13-51 (C/C++), as well as all Magick.NET NuGet packages prior to version 14.15.0. The vulnerability carries a CVSS v3.1 base score of 4.7 (Medium) (GitHub Advisory, ImageMagick Advisory).

The root cause is an integer overflow or wraparound (CWE-190) during the processing of a user-supplied morphology kernel, which subsequently leads to an out-of-bounds write (CWE-787) on the heap. When ImageMagick calculates buffer sizes for the morphology operation using an invalid kernel, an integer overflow causes the allocation to be undersized, and the subsequent write exceeds the allocated buffer boundary. Exploitation requires local access, high attack complexity, and user interaction — for example, a user must open or process a specially crafted image or kernel file (GitHub Advisory, ImageMagick Advisory).

Successful exploitation results in a denial of service through application crash or memory corruption, with high availability impact and no confidentiality or integrity impact. The vulnerability is scoped to the affected component and does not enable privilege escalation or lateral movement. Applications that process user-supplied images or kernel definitions using vulnerable ImageMagick or Magick.NET versions are at risk of being crashed or destabilized (GitHub Advisory).

Users should upgrade to the patched versions of ImageMagick (7.1.2-26 or 6.9.13-51) or Magick.NET (14.15.0 or later) to remediate this vulnerability. No configuration-based workarounds have been published; upgrading is the recommended and only confirmed fix. Organizations processing untrusted image or kernel input should prioritize this update, particularly in environments where ImageMagick is exposed to user-supplied data (ImageMagick Advisory, Magick.NET Release).