CVE-2025-12183
📋 TL;DR
This vulnerability in lz4-java library allows remote attackers to cause denial of service and potentially read adjacent memory by sending specially crafted compressed input. It affects applications using lz4-java 1.8.0 or earlier for data decompression. Any Java application processing untrusted compressed data with this library is vulnerable.
💻 Affected Systems
- lz4-java library
- Any Java application using lz4-java for compression/decompression
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution through memory corruption leading to complete system compromise, though this requires specific memory layout conditions.
Likely Case
Denial of service through application crashes and potential information disclosure via memory reads.
If Mitigated
Limited impact with proper input validation and sandboxing, though denial of service remains possible.
🎯 Exploit Status
Exploitation requires sending malicious compressed data to vulnerable endpoint. No authentication needed if service accepts external input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.8.1
Vendor Advisory: https://github.com/yawkat/lz4-java/releases/tag/v1.8.1
Restart Required: Yes
Instructions:
1. Update lz4-java dependency to version 1.8.1 or later in your build configuration (Maven/Gradle). 2. Rebuild and redeploy your application. 3. Restart affected services.
🔧 Temporary Workarounds
Input validation and sanitization
allValidate and sanitize all compressed input before processing with lz4-java library
Network filtering
allImplement network-level filtering to block or limit compressed data from untrusted sources
🧯 If You Can't Patch
- Implement strict input validation and size limits on compressed data
- Isolate vulnerable services in network segments with limited access
🔍 How to Verify
Check if Vulnerable:
Check your project's dependency management file (pom.xml, build.gradle) for lz4-java version 1.8.0 or earlierCheck Version:
mvn dependency:tree | grep lz4-java OR gradle dependencies | grep lz4-javaVerify Fix Applied:
Verify lz4-java version 1.8.1 or later appears in your dependency tree after update📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- OutOfMemoryError or segmentation faults in Java logs
- Unusual decompression failures
Network Indicators:
- Unusually large or malformed compressed data packets
- Repeated connection attempts with compressed payloads
SIEM Query:
source="application.logs" AND ("OutOfMemoryError" OR "segmentation fault" OR "lz4" AND "error")