CVE-2025-50952
📋 TL;DR
This CVE describes a NULL pointer dereference vulnerability in openjpeg v2.5.0's DWT component that can cause denial of service. Attackers can crash applications using the library by providing specially crafted JPEG2000 images. This affects any software or system using vulnerable versions of the openjpeg library for JPEG2000 image processing.
💻 Affected Systems
- openjpeg
- software using libopenjp2 library
📦 What is this software?
Openjpeg by Uclouvain
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potentially disrupting critical image processing workflows or services.
Likely Case
Application crash when processing malicious JPEG2000 images, requiring restart of affected services.
If Mitigated
Minimal impact with proper input validation and sandboxing of image processing operations.
🎯 Exploit Status
Exploitation requires crafting a malicious JPEG2000 image that triggers the NULL pointer dereference. No authentication bypass needed if application accepts image uploads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: openjpeg version 2.5.1 or later
Vendor Advisory: https://github.com/uclouvain/openjpeg/issues/1505
Restart Required: No
Instructions:
1. Update openjpeg to version 2.5.1 or later using your package manager. 2. For Debian/Ubuntu: sudo apt update && sudo apt upgrade libopenjp2-7. 3. Recompile any applications statically linked to openjpeg with the patched library.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict validation of JPEG2000 images before processing, rejecting malformed or suspicious files.
Sandbox image processing
allRun openjpeg image processing in isolated containers or sandboxes to limit impact of crashes.
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using openjpeg from untrusted networks
- Deploy web application firewalls to block malicious JPEG2000 file uploads
🔍 How to Verify
Check if Vulnerable:
Check openjpeg version: dpkg -l | grep libopenjp2 or openjp2 --versionCheck Version:
openjp2 --versionVerify Fix Applied:
Verify version is 2.5.1 or later: openjp2 --version | grep -q '2.5.[1-9]\|2.[6-9]\|[3-9]'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults when processing JPEG2000 images
- Error logs containing 'SIGSEGV' or 'segmentation fault' in openjpeg context
Network Indicators:
- Unusual spikes in JPEG2000 file uploads followed by service restarts
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "SIGSEGV") AND "openjpeg"