CVE-2026-67862 open62541 CVE debrief

Who should care

Organizations using open62541 1.5.5, security teams, and IT administrators should be aware of this vulnerability. They should review the CVE record and NVD details to understand the potential impact and take necessary actions to prevent denial of service attacks. Additionally, operators and platforms using open62541 1.5.5 may be affected and should take necessary precautions.

Technical summary

The open62541 1.5.5 version contains a buffer-overflow vulnerability in the high-level attribute reading logic. This allows a remote attacker to cause a denial of service. The vulnerability affects open62541 1.5.5 and may impact organizations using this version. Security teams and IT administrators should review the CVE record and NVD details for more information. The vulnerability is located in src/client/ua_client_highlevel.c and can be triggered by a remote attacker. Limited details are available about affected products and versions.

Defensive priority

Organizations using open62541 1.5.5 should prioritize patching to prevent potential denial of service attacks.

Recommended defensive actions

• Apply patches or updates for open62541 1.5.5
• Review and update inventory of open62541 installations
• Monitor for potential denial of service attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record indicates a buffer-overflow vulnerability in open62541 1.5.5. Limited details are available about affected products and versions. The vulnerability allows a remote attacker to cause a denial of service. Evidence is based on the CVE record and NVD details. Defenders should verify affected product deployments, review official advisories, and monitor for potential denial of service attacks. Additional information may be needed to fully assess the vulnerability's impact.

Official resources