CVE-2025-65018
📋 TL;DR
A heap buffer overflow vulnerability in libpng's simplified API allows attackers to execute arbitrary code or cause denial of service by crafting malicious 16-bit interlaced PNG files. This affects applications using libpng versions 1.6.0 through 1.6.50 to process PNG images. Any software that loads PNG files via the png_image_finish_read function is potentially vulnerable.
💻 Affected Systems
- libpng
- Any software using libpng library
📦 What is this software?
Libpng by Libpng
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash (denial of service) or memory corruption leading to unstable behavior.
If Mitigated
Controlled crash with minimal impact if proper memory protections (ASLR, DEP) are enabled.
🎯 Exploit Status
Exploitation requires crafting specific PNG files but doesn't require authentication. The vulnerability is in a widely used library.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.51
Vendor Advisory: https://github.com/pnggroup/libpng/security/advisories/GHSA-7wv6-48j4-hj3g
Restart Required: Yes
Instructions:
1. Download libpng 1.6.51 from official sources. 2. Replace existing libpng installation. 3. Recompile any statically linked applications. 4. Restart affected services.
🔧 Temporary Workarounds
Disable PNG processing
allTemporarily disable PNG file processing in vulnerable applications
Input validation
allReject 16-bit interlaced PNG files at application level
🧯 If You Can't Patch
- Implement strict file type validation to reject suspicious PNG files
- Deploy memory protection mechanisms (ASLR, DEP, stack canaries)
🔍 How to Verify
Check if Vulnerable:
Check libpng version with: pngtest --version or ldd on binary to check linked library versionCheck Version:
pngtest --version | grep -i libpngVerify Fix Applied:
Verify libpng version is 1.6.51 or higher📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected termination of PNG processing services
Network Indicators:
- Unusual PNG file uploads to web applications
- Spike in PNG file transfers
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "access violation" OR "heap corruption") AND process="*png*"🔗 References
- https://github.com/pnggroup/libpng/commit/16b5e3823918840aae65c0a6da57c78a5a496a4d
- https://github.com/pnggroup/libpng/commit/218612ddd6b17944e21eda56caf8b4bf7779d1ea
- https://github.com/pnggroup/libpng/issues/755
- https://github.com/pnggroup/libpng/pull/757
- https://github.com/pnggroup/libpng/security/advisories/GHSA-7wv6-48j4-hj3g
- https://github.com/pnggroup/libpng/issues/755
- https://github.com/pnggroup/libpng/security/advisories/GHSA-7wv6-48j4-hj3g
