Headline

GHSA-6hjr-v6g4-3fm8: ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)

Summary

The TIM (PSX TIM) image parser in ImageMagick contains a critical integer overflow vulnerability in the ReadTIMImage function (coders/tim.c). The code reads width and height (16-bit values) from the file header and calculates image_size = 2 * width * height without checking for overflow. On 32-bit systems (or where size_t is 32-bit), this calculation can overflow if width and height are large (e.g., 65535), wrapping around to a small value. This results in a small heap allocation via AcquireQuantumMemory and later operations relying on the dimensions can trigger an out of bounds read.

Vulnerable Code

File: coders/tim.c

width=ReadBlobLSBShort(image);
height=ReadBlobLSBShort(image);
image_size=2*width*height;       // Line 234 - NO OVERFLOW CHECK!

Impact

This vulnerability can lead to Arbitrary Memory Disclosure due to an out of bounds read on 32-bit systems.

3 hours ago

ghsa

Open in Source

#vulnerability #git

GitHub Advisory Database
GitHub Reviewed
CVE-2025-66628

ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)

High severity GitHub Reviewed Published Dec 10, 2025 in ImageMagick/ImageMagick • Updated Dec 10, 2025

Package

nuget Magick.NET-Q16-AnyCPU (NuGet)

Affected versions

< 14.10.0

nuget Magick.NET-Q16-HDRI-AnyCPU (NuGet)

nuget Magick.NET-Q16-HDRI-x86 (NuGet)

nuget Magick.NET-Q16-x86 (NuGet)

nuget Magick.NET-Q8-AnyCPU (NuGet)

nuget Magick.NET-Q8-x86 (NuGet)

Summary

The TIM (PSX TIM) image parser in ImageMagick contains a critical integer overflow vulnerability in the ReadTIMImage function (coders/tim.c). The code reads width and height (16-bit values) from the file header and calculates image_size = 2 * width * height without checking for overflow.
On 32-bit systems (or where size_t is 32-bit), this calculation can overflow if width and height are large (e.g., 65535), wrapping around to a small value. This results in a small heap allocation via AcquireQuantumMemory and later operations relying on the dimensions can trigger an out of bounds read.

Vulnerable Code

File: coders/tim.c

width=ReadBlobLSBShort(image); height=ReadBlobLSBShort(image); image_size=2*width*height; // Line 234 - NO OVERFLOW CHECK!

Impact

This vulnerability can lead to Arbitrary Memory Disclosure due to an out of bounds read on 32-bit systems.

References