Integer overflow in O6 Automation Open62541

CVE-2026-65423

An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a remote attacker to trigger an out-of-bounds write.

Vulnerability class: Integer Overflow

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-65423?
CVE-2026-65423 is a high-severity vulnerability in O6 Automation Open62541, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2026-07-30.
How severe is CVE-2026-65423?
High severity. CVSS v3 base score is 8.8 out of 10.