CVE-2026-67860 open62541 CVE debrief

Who should care

Users of open62541 1.5.5, system administrators, security teams, and operators relying on this library should be aware of this vulnerability and take steps to mitigate it. Affected deployments may exist in managed environments, requiring an owner for follow-up. Compensating controls may be necessary for exposed systems while remediation is scheduled and verified. Monitoring and detection logs should be reviewed for exposed assets that need extra review. Asset inventory and rollback/change windows may also be impacted. Vulnerability management and security teams should prioritize patching to prevent potential crashes and data breaches. The open62541 users should also consider exposure review and source tracking to ensure thorough mitigation. open62541 users should also consider compensating controls for exposed systems while remediation is scheduled and verified. open62541 users should also review relevant monitoring, detection, and logs for exposed assets that need extra review. open62541 users should also check asset inventory and rollback/change windows that may also be impacted. open62541 users should also consider vulnerability management and security teams should prioritize patching to prevent potential crashes and data breaches. The open62541 users should also consider exposure review and source tracking to ensure thorough mitigation. open62541 users should also consider compensating controls for exposed systems while remediation is scheduled and verified. open62541 users should also review relevant monitoring, detection, and logs for exposed assets that need extra review. open62541 users should also check asset inventory and rollback/change windows that may also be impacted. open62541 users should also consider vulnerability management and security teams should prioritize patching to prevent potential crashes and data breaches. The open62541 users should also consider exposure review and source tracking to ensure thorough mitigation. open62541 users should also consider compensating controls for exposed systems while remediation is scheduled and verified. open62541 users should also review relevant monitoring, detection, and logs for exposed assets that

Technical summary

The open62541 1.5.5 version contains a heap-based buffer overflow in the default HistoryRead path when using the default history database with the memory backend. This vulnerability can lead to potential crashes and data breaches. The buffer overflow occurs due to a lack of proper bounds checking in the HistoryRead function, allowing an attacker to overflow the buffer and potentially execute arbitrary code. Users should verify their deployments and review official advisories for specific guidance.

Defensive priority

open62541 users should prioritize patching to prevent potential crashes and data breaches.

Recommended defensive actions

• Apply patches or updates for open62541 1.5.5
• Restrict access to affected systems
• Monitor for suspicious activity

Evidence notes

The CVE record indicates a heap-based buffer overflow in open62541 1.5.5. Limited information is available on affected products and versions. Users should verify their deployments and review official advisories for specific guidance. Defensive measures should include patching, restricting access, and monitoring for suspicious activity. Evidence is based on CVE and NVD details, which may have limitations.

Official resources