CVE-2026-2588
📋 TL;DR
This CVE describes an integer overflow vulnerability in Crypt::NaCl::Sodium Perl module versions through 2.001 on 32-bit systems. The flaw occurs when casting size_t to unsigned long long, potentially causing buffer overflows or memory corruption when processing large inputs. Only Perl applications using this cryptographic library on 32-bit architectures are affected.
💻 Affected Systems
- Crypt::NaCl::Sodium Perl module
📦 What is this software?
Crypt\ by Timlegge
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, potentially compromising the entire system running the vulnerable Perl application.
Likely Case
Application crashes (denial of service) when processing specially crafted large inputs, potentially causing data loss or service disruption.
If Mitigated
No impact if proper input validation and size checking is implemented before passing data to the vulnerable functions.
🎯 Exploit Status
Exploitation requires sending specially crafted large inputs to trigger the integer overflow. No public exploits have been documented as of the available information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2.001 (patches available in GitHub commits)
Vendor Advisory: https://metacpan.org/release/TIMLEGGE/Crypt-NaCl-Sodium
Restart Required: Yes
Instructions:
1. Update Crypt::NaCl::Sodium using CPAN: 'cpan Crypt::NaCl::Sodium'
2. Or install from source using patched version from GitHub
3. Restart any Perl applications using the library
🔧 Temporary Workarounds
Input size validation
allImplement input size checking in application code before passing data to Crypt::NaCl::Sodium functions
Migrate to 64-bit systems
allDeploy affected applications on 64-bit operating systems where the vulnerability does not exist
🧯 If You Can't Patch
- Implement strict input validation to reject inputs larger than safe limits
- Monitor application logs for crashes or abnormal behavior related to cryptographic operations
🔍 How to Verify
Check if Vulnerable:
Check Perl module version: 'perl -MCrypt::NaCl::Sodium -e "print $Crypt::NaCl::Sodium::VERSION"' and verify if ≤2.001 on 32-bit systemCheck Version:
perl -MCrypt::NaCl::Sodium -e "print $Crypt::NaCl::Sodium::VERSION"Verify Fix Applied:
Verify updated version >2.001 is installed and test with sample inputs that previously triggered issues📡 Detection & Monitoring
Log Indicators:
- Perl application crashes with segmentation faults
- Memory corruption errors in system logs
- Abnormal termination of Perl processes using cryptography
Network Indicators:
- Unusually large data payloads sent to applications using Crypt::NaCl::Sodium
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "memory corruption") AND process="perl"