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

CVE-2026-30937 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

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

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-03-12 14:16:51 UTC
Updated
2026-03-12 14:16:53 UTC
GitHub reviewed
2026-03-12 14:16:51 UTC
NVD published
2026-03-10

EPSS Score

Score Percentile
0.02% 3.95%

CVSS Scores

Base score Version Severity Vector
6.8 3.1 —
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-qpg4-j99f-8xcg ↗
CVE CVE-2026-30937 ↗

CWEs

CWE id Name
CWE-122 Heap-based Buffer Overflow

Credits

  • ylwango613 (reporter)

Affected packages (19)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
nuget Magick.NET-Q16-AnyCPU < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-HDRI-AnyCPU < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-HDRI-OpenMP-arm64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-HDRI-arm64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-HDRI-x64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-HDRI-x86 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-OpenMP-arm64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-OpenMP-x64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-OpenMP-x86 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-arm64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-x64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-x86 < 14.10.4 14.10.4 —
nuget Magick.NET-Q16-HDRI-OpenMP-x64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q8-AnyCPU < 14.10.4 14.10.4 —
nuget Magick.NET-Q8-OpenMP-arm64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q8-OpenMP-x64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q8-arm64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q8-x64 < 14.10.4 14.10.4 —
nuget Magick.NET-Q8-x86 < 14.10.4 14.10.4 —

References

cvelogic Threat Intelligence