MEDIUM 6.5 NuGet
ImageMagick has Global Buffer Overflow (OOB Read) via Negative Pixel Index in UIL and XPM Writer
GHSA-vpxv-r9pg-7gpr · CVE-2026-25898
Published · Modified
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Description
The UIL and XPM image encoder do not validate the pixel index value returned by GetPixelIndex() before using it as an array subscript. In HDRI builds, Quantum is a floating-point type, so pixel index values can be negative. An attacker can craft an image with negative pixel index values to trigger a global buffer overflow read during conversion, leading to information disclosure or a process crash.
READ of size 1 at 0x55a8823a776e thread T0
#0 0x55a880d01e85 in WriteUILImage coders/uil.c:355
READ of size 1 at 0x55fa1c04c66e thread T0
#0 0x55fa1a9ee415 in WriteXPMImage coders/xpm.c:1135
References
- WEB https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-vpxv-r9pg-7gpr
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-25898
- WEB https://github.com/ImageMagick/ImageMagick/commit/c9c87dbaba56bf82aebd3392e11f0ffd93709b12
- PACKAGE https://github.com/ImageMagick/ImageMagick
- WEB https://github.com/dlemstra/Magick.NET/releases/tag/14.10.3
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