CVE-2026-25987
📋 TL;DR
ImageMagick contains a heap buffer over-read vulnerability in its MAP image decoder that could allow attackers to cause crashes or leak memory by processing specially crafted MAP files. This affects all systems running vulnerable versions of ImageMagick that process untrusted MAP images. The vulnerability is rated CVSS 5.3 (Medium severity).
💻 Affected Systems
- ImageMagick
📦 What is this software?
Imagemagick by Imagemagick
Imagemagick by Imagemagick
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution through memory corruption leading to complete system compromise, though this is unlikely given the nature of a buffer over-read.
Likely Case
Application crashes (denial of service) or unintended memory disclosure revealing sensitive information from the application's memory space.
If Mitigated
Limited impact with proper input validation and sandboxing, potentially just failed image processing.
🎯 Exploit Status
Exploitation requires the attacker to supply a malicious MAP file that gets processed by ImageMagick. No authentication is needed if the system processes untrusted files.
🛠️ 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-42p5-62qq-mmh7
Restart Required: Yes
Instructions:
1. Update ImageMagick using your system's package manager (apt, yum, brew, etc.) 2. Restart any services or applications using ImageMagick 3. Verify the update with 'convert --version' or 'magick --version'
🔧 Temporary Workarounds
Disable MAP format support
allRemove or disable MAP format decoder in ImageMagick policy.xml
Edit /etc/ImageMagick-7/policy.xml or /etc/ImageMagick-6/policy.xml
Add: <policy domain="coder" rights="none" pattern="MAP" />
Input validation and sanitization
allReject or convert MAP files before processing with ImageMagick
Implement file type validation in applications
Convert MAP to safe formats before ImageMagick processing
🧯 If You Can't Patch
- Implement strict input validation to reject MAP files from untrusted sources
- Run ImageMagick in a sandboxed environment with limited privileges and memory restrictions
🔍 How to Verify
Check if Vulnerable:
Check ImageMagick version with 'convert --version' or 'magick --version' and compare against vulnerable versionsCheck Version:
convert --version 2>/dev/null || magick --version 2>/dev/null || echo "ImageMagick not found"Verify Fix Applied:
Confirm version is 7.1.2-15 or higher (for ImageMagick 7) or 6.9.13-40 or higher (for ImageMagick 6)📡 Detection & Monitoring
Log Indicators:
- ImageMagick segmentation faults or crashes
- Failed MAP file processing errors
- Memory allocation failures in ImageMagick logs
Network Indicators:
- Unusual MAP file uploads to web applications
- Multiple failed image processing requests
SIEM Query:
source="*imagick*" AND ("segmentation fault" OR "MAP" OR "buffer over-read")