CVE-2025-40930
📋 TL;DR
CVE-2025-40930 is an integer buffer overflow vulnerability in JSON::SIMD Perl module versions before 1.07. When parsing malicious JSON input, it causes a segmentation fault, enabling denial-of-service attacks against applications using this library. Any Perl application using vulnerable JSON::SIMD versions is affected.
💻 Affected Systems
- JSON::SIMD Perl module
⚠️ 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 or complete system crash leading to persistent downtime
Likely Case
Application crashes causing denial-of-service, potentially disrupting dependent services
If Mitigated
Limited service interruption with proper monitoring and rapid recovery procedures
🎯 Exploit Status
Exploitation requires ability to send JSON input to vulnerable application
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.07
Vendor Advisory: https://metacpan.org/release/PJUHASZ/JSON-SIMD-1.07/changes
Restart Required: Yes
Instructions:
1. Update JSON::SIMD using CPAN: 'cpan JSON::SIMD'
2. Verify installation of version 1.07 or later
3. Restart all Perl applications using JSON::SIMD
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict JSON input validation and size limits before passing to JSON::SIMD
Use alternative JSON parser
allTemporarily switch to JSON::XS or other JSON parsing libraries
cpan JSON::XS
Update code to use JSON::XS instead of JSON::SIMD
🧯 If You Can't Patch
- Implement WAF rules to block suspicious JSON payloads
- Isolate vulnerable applications behind reverse proxies with request filtering
🔍 How to Verify
Check if Vulnerable:
Check installed JSON::SIMD version: 'perl -MJSON::SIMD -e "print $JSON::SIMD::VERSION\n"'Check Version:
perl -MJSON::SIMD -e "print $JSON::SIMD::VERSION\n"Verify Fix Applied:
Verify version is 1.07 or higher using same command📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- Unexpected process termination
- High rate of JSON parsing failures
Network Indicators:
- Unusually large JSON payloads
- Repeated JSON requests causing service disruption
SIEM Query:
source="application.log" AND ("segmentation fault" OR "SIGSEGV") AND process="perl"