CVE-2025-48379
📋 TL;DR
This CVE describes a heap buffer overflow vulnerability in the Python Pillow library when saving large DDS format images. Attackers could potentially execute arbitrary code or crash applications by providing malicious DDS images. Only users who save untrusted data as compressed DDS images are affected.
💻 Affected Systems
- Python Pillow (PIL Fork)
📦 What is this software?
Pillow by Python
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Application crashes (denial of service) or memory corruption leading to unstable behavior.
If Mitigated
No impact if untrusted DDS images are not processed or if proper input validation is implemented.
🎯 Exploit Status
Exploitation requires crafting a malicious DDS image >64k when encoded with default settings. No public exploits have been reported.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.3.0
Vendor Advisory: https://github.com/python-pillow/Pillow/security/advisories/GHSA-xg8h-j46f-w952
Restart Required: No
Instructions:
1. Update Pillow using pip: 'pip install --upgrade pillow==11.3.0' 2. Verify installation with: 'pip show pillow' 3. Restart any running Python applications using Pillow.
🔧 Temporary Workarounds
Disable DDS format processing
allModify code to reject or skip DDS format images from untrusted sources
# In Python code, add validation before processing:
if image_format == 'DDS':
raise ValueError('DDS format not allowed from untrusted sources')
Size limit on DDS images
allImplement file size validation for DDS images before processing
# Check file size before processing DDS:
if os.path.getsize(dds_file) > 65536: # 64KB limit
raise ValueError('DDS file too large')
🧯 If You Can't Patch
- Implement strict input validation to reject DDS images from untrusted sources
- Deploy application-level firewalls or WAFs to block DDS file uploads
🔍 How to Verify
Check if Vulnerable:
Run 'pip show pillow' and check if version is between 11.2.0 and 11.2.99Check Version:
pip show pillow | grep VersionVerify Fix Applied:
Run 'pip show pillow' and confirm version is 11.3.0 or higher📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing DDS images
- Memory access violation errors in application logs
- Unusual Python process termination
Network Indicators:
- Large DDS file uploads (>64KB) to web applications
- Multiple failed DDS processing attempts
SIEM Query:
source="application.logs" AND ("DDS" OR "pillow") AND ("crash" OR "segmentation fault" OR "buffer overflow")