CVE-2026-25798
📋 TL;DR
A NULL pointer dereference vulnerability in ImageMagick's ClonePixelCacheRepository function allows remote attackers to crash applications by providing a specially crafted image file, causing denial of service. This affects any application using vulnerable ImageMagick versions to process untrusted images. The vulnerability is triggered during image processing operations.
💻 Affected Systems
- ImageMagick
📦 What is this software?
Imagemagick by Imagemagick
Imagemagick by Imagemagick
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service for all users, potentially disrupting critical image processing workflows or web services that rely on ImageMagick.
Likely Case
Application crashes when processing malicious images, causing temporary service disruption until the application restarts.
If Mitigated
Minimal impact with proper input validation and sandboxing; crashes are contained to individual processes without affecting the entire system.
🎯 Exploit Status
Exploitation is straightforward: attackers can create malicious images that trigger the NULL pointer dereference when processed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.1.2-15 and 6.9.13-40
Vendor Advisory: https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-p863-5fgm-rgq4
Restart Required: Yes
Instructions:
1. Update ImageMagick to version 7.1.2-15 or 6.9.13-40 using your package manager. 2. Restart all applications using ImageMagick. 3. Rebuild any applications statically linked with ImageMagick.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict validation of image files before processing with ImageMagick.
Process isolation
linuxRun ImageMagick in isolated containers or sandboxes to limit crash impact.
docker run --security-opt=no-new-privileges imagemagick-container
🧯 If You Can't Patch
- Implement strict file type validation and reject suspicious image formats
- Deploy ImageMagick in containerized environments with automatic restart policies
🔍 How to Verify
Check if Vulnerable:
Check ImageMagick version with 'convert --version' or 'magick --version' and compare against vulnerable versions.Check Version:
convert --version | head -1Verify Fix Applied:
Verify version is 7.1.2-15 or higher (for version 7) or 6.9.13-40 or higher (for version 6).📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation fault errors
- ImageMagick process termination logs
- Increased restart frequency of services using ImageMagick
Network Indicators:
- Unusual image upload patterns
- Multiple failed image processing requests
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "ImageMagick" AND "crash")