7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-24485

CVE-2026-24485: ImageMagick: Infinite loop vulnerability when parsing a PCD file

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-15 and 6.9.13-40, when a PCD file does not contain a valid Sync marker, the DecodeImage() function becomes trapped in an infinite loop while searching for the Sync marker, causing the program to become unresponsive and continuously consume CPU resources, ultimately leading to system resource exhaustion and denial of service. Versions 7.1.2-15 and 6.9.13-40 contain a patch.

(GitHub Advisory)

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CVE-2026-24485

CVE-2026-24485:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Magick.NET-Q16-AnyCPU	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-AnyCPU	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-OpenMP-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-OpenMP-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-x86	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-OpenMP-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-OpenMP-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-OpenMP-x86	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-x86	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-AnyCPU	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-OpenMP-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-OpenMP-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-x86	nuget	< 14.10.3	14.10.3

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability description explicitly points to an infinite loop in the DecodeImage function when parsing a PCD file without a valid marker. The provided commit 332c1566acc2de77857032d3c2504ead6210ff50 modifies the coders/pcd.c file. Analysis of the patch shows that the PCDGetBits macro, which is used within DecodeImage, is modified to check the return value of the ReadBlob function. Previously, the code would loop indefinitely if ReadBlob failed to read the expected number of bytes (e.g., at the end of a malformed file). The patch adds a break statement to exit the loop in such cases, preventing the denial of service. Therefore, DecodeImage is the primary vulnerable function. The ReadPCDImage function is also identified as it is the parent function that calls DecodeImage and would be present in a runtime profile during exploitation.

Vulnerable functions

DecodeImage

coders/pcd.c

The `DecodeImage` function in `coders/pcd.c` is vulnerable to an infinite loop. Within the `PCDGetBits` macro, the code reads from the image file in a loop. Prior to the patch, the return value of `ReadBlob` was not checked. If the end of the file was reached without finding a valid marker, `ReadBlob` would return fewer bytes than requested, but the loop would continue indefinitely, causing a denial of service. The patch introduces a check on the number of bytes read and breaks the loop if it's not the expected amount, thus fixing the infinite loop.

ReadPCDImage

coders/pcd.c

The `ReadPCDImage` function is the entry point for reading PCD images and it calls the vulnerable `DecodeImage` function. While the infinite loop vulnerability is in `DecodeImage`, `ReadPCDImage` is the function that orchestrates the reading process and would be on the stack trace during exploitation. The patch also includes changes to this function for variable declarations and memory allocation, which are related to the overall robustness of the PCD image reader.

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WAF Rule

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Reasoning

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