CVE-2026-1301
📋 TL;DR
This vulnerability allows an attacker to send a specially crafted JSON message to systems with PubSub and JSON enabled, causing a heap buffer overflow before authentication. This reliably crashes the process and corrupts memory, potentially leading to denial of service or remote code execution. Systems using affected builds with these features enabled are vulnerable.
💻 Affected Systems
- Products using builds with PubSub and JSON features enabled
⚠️ 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 leading to complete system compromise, data theft, or lateral movement within the network.
Likely Case
Denial of service through process crashes and memory corruption, disrupting service availability.
If Mitigated
Limited to denial of service if proper memory protections and network segmentation are in place.
🎯 Exploit Status
Exploitation requires sending crafted JSON messages to vulnerable endpoints before authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-26-036-03
Restart Required: Yes
Instructions:
1. Review the CISA advisory for affected products. 2. Contact your vendor for patched versions. 3. Apply vendor-provided patches. 4. Restart affected services.
🔧 Temporary Workarounds
Disable JSON feature
allDisable JSON message processing if not required, preventing exploitation.
Consult vendor documentation for configuration commands to disable JSON support
Network segmentation
allRestrict network access to vulnerable services using firewalls or network policies.
Configure firewall rules to limit inbound connections to trusted sources only
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Monitor for abnormal process crashes and memory corruption events
🔍 How to Verify
Check if Vulnerable:
Check if your system uses builds with PubSub and JSON enabled; review configuration files and vendor documentation.Check Version:
Consult vendor-specific commands to check software version and build configurationVerify Fix Applied:
Verify patch installation via version checks and test with safe JSON messages to ensure stability.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes
- Memory corruption errors in system logs
- Malformed JSON parsing errors
Network Indicators:
- Unusual JSON payloads to PubSub endpoints
- Traffic spikes to vulnerable ports
SIEM Query:
source="*" ("process crash" OR "memory corruption" OR "heap overflow") AND dest_port="[vulnerable_port]"