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

Moderate severity GitHub Reviewed Published Mar 9, 2026 in ImageMagick/ImageMagick • Updated Mar 12, 2026

Package

nuget Magick.NET-Q16-AnyCPU (NuGet)

Affected versions

< 14.10.4

Patched versions

14.10.4
nuget Magick.NET-Q16-HDRI-AnyCPU (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-HDRI-arm64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-HDRI-x64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-HDRI-x86 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-OpenMP-arm64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-OpenMP-x64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-OpenMP-x86 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-arm64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-x64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q16-x86 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q8-AnyCPU (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q8-OpenMP-arm64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q8-OpenMP-x64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q8-arm64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q8-x64 (NuGet)
< 14.10.4
14.10.4
nuget Magick.NET-Q8-x86 (NuGet)
< 14.10.4
14.10.4

Description

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

References

@dlemstra dlemstra published to ImageMagick/ImageMagick Mar 9, 2026
Published by the National Vulnerability Database Mar 10, 2026
Published to the GitHub Advisory Database Mar 12, 2026
Reviewed Mar 12, 2026
Last updated Mar 12, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(3rd percentile)

Weaknesses

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Learn more on MITRE.

CVE ID

CVE-2026-30937

GHSA ID

GHSA-qpg4-j99f-8xcg

Source code

Credits

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