CVE-2026-25794
📋 TL;DR
This vulnerability in ImageMagick allows attackers to trigger an integer overflow when processing large UHDR images, leading to heap buffer overflow and potential arbitrary code execution. Any system using vulnerable ImageMagick versions to process untrusted image files is affected, particularly web applications that accept image uploads.
💻 Affected Systems
- ImageMagick
📦 What is this software?
Imagemagick by Imagemagick
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crashes (denial of service) or memory corruption that could be leveraged for information disclosure.
If Mitigated
Denial of service only if proper sandboxing prevents code execution.
🎯 Exploit Status
Exploitation requires crafting malicious UHDR images; no public exploit code known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.1.2-15
Vendor Advisory: https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-vhqj-f5cj-9x8h
Restart Required: No
Instructions:
1. Update ImageMagick to version 7.1.2-15 or later using your package manager. 2. For Linux: 'sudo apt update && sudo apt upgrade imagemagick' (Debian/Ubuntu) or 'sudo yum update imagemagick' (RHEL/CentOS). 3. Verify installation with 'convert --version'.
🔧 Temporary Workarounds
Disable UHDR coder
linuxRemove UHDR format support from ImageMagick policy configuration
Edit /etc/ImageMagick-7/policy.xml and add: <policy domain="coder" rights="none" pattern="UHDR" />
Image size limits
linuxLimit maximum image dimensions in ImageMagick configuration
Edit /etc/ImageMagick-7/policy.xml and add: <policy domain="resource" name="width" value="8192"/> <policy domain="resource" name="height" value="8192"/>
🧯 If You Can't Patch
- Implement strict input validation to reject UHDR format images entirely
- Run ImageMagick in sandboxed containers with minimal privileges
🔍 How to Verify
Check if Vulnerable:
Run 'convert --version' and check if version is below 7.1.2-15Check Version:
convert --version | head -1Verify Fix Applied:
Confirm version is 7.1.2-15 or higher with 'convert --version'📡 Detection & Monitoring
Log Indicators:
- ImageMagick process crashes
- Segmentation faults in application logs
- Failed UHDR image processing
Network Indicators:
- Unusual UHDR file uploads to web applications
SIEM Query:
process.name:"convert" AND event.action:"segmentation fault"