CVE-2026-30937

ImageMagick has heap buffer overflow in WriteXWDImage due to CARD32 arithmetic overflow in bytesperline calculation

A 32-bit unsigned integer overflow in the XWD (X Windows) encoder can cause an undersized heap buffer allocation. When writing a extremely large image an out of bounds heap write can occur.

=================================================================
==741961==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x5020000083dc at pc 0x56553b4c4245 bp 0x7ffd9d20fef0 sp 0x7ffd9d20fee0
WRITE of size 1 at 0x5020000083dc thread T0

CVE-2026-30937 has a CVSS score of 6.8 (Medium). The vector is requires local access, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (14.10.4); upgrading removes the vulnerable code path.

Kodem intelligence

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1. What is CVE-2026-30937? CVE-2026-30937 is a medium-severity security vulnerability in Magick.NET-Q16-AnyCPU (nuget), affecting versions < 14.10.4. It is fixed in 14.10.4.
2. How severe is CVE-2026-30937? CVE-2026-30937 has a CVSS score of 6.8 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2026-30937?
   • Magick.NET-Q16-AnyCPU (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-HDRI-AnyCPU (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-HDRI-OpenMP-arm64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-HDRI-arm64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-HDRI-x64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-HDRI-x86 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-OpenMP-arm64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-OpenMP-x64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-OpenMP-x86 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-arm64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-x64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-x86 (nuget) (versions < 14.10.4)
   • Magick.NET-Q16-HDRI-OpenMP-x64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q8-AnyCPU (nuget) (versions < 14.10.4)
   • Magick.NET-Q8-OpenMP-arm64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q8-OpenMP-x64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q8-arm64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q8-x64 (nuget) (versions < 14.10.4)
   • Magick.NET-Q8-x86 (nuget) (versions < 14.10.4)
4. Is there a fix for CVE-2026-30937? Yes. CVE-2026-30937 is fixed in 14.10.4. Upgrade to this version or later.
5. Is CVE-2026-30937 exploitable, and should I be worried? Whether CVE-2026-30937 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-30937 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-30937?
   • Upgrade Magick.NET-Q16-AnyCPU to 14.10.4 or later
   • Upgrade Magick.NET-Q16-HDRI-AnyCPU to 14.10.4 or later
   • Upgrade Magick.NET-Q16-HDRI-OpenMP-arm64 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-HDRI-arm64 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-HDRI-x64 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-HDRI-x86 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-OpenMP-arm64 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-OpenMP-x64 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-OpenMP-x86 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-arm64 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-x64 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-x86 to 14.10.4 or later
   • Upgrade Magick.NET-Q16-HDRI-OpenMP-x64 to 14.10.4 or later
   • Upgrade Magick.NET-Q8-AnyCPU to 14.10.4 or later
   • Upgrade Magick.NET-Q8-OpenMP-arm64 to 14.10.4 or later
   • Upgrade Magick.NET-Q8-OpenMP-x64 to 14.10.4 or later
   • Upgrade Magick.NET-Q8-arm64 to 14.10.4 or later
   • Upgrade Magick.NET-Q8-x64 to 14.10.4 or later
   • Upgrade Magick.NET-Q8-x86 to 14.10.4 or later

Other vulnerabilities in Magick.NET-Q16-AnyCPU