CVE-2026-65423

o6 Automation open62541 Integer Overflow or Wraparound

Published Jul 30, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
An integer overflow in the UA_Variant arrayDimensions product
computation in open62541 may allow a remote attacker to trigger an
out-of-bounds write.

Remediation

Vendor Solution

o6 Automation has prepared mitigations and fixes to address these issues and recommends that users update to the newest version. The new version can be obtained by contacting o6 Automation   https://www.o6-automation.com/contact or by downloading from the following locations: https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df For more information, see open62541 Security Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or contact o6 Automation:  https://www.o6-automation.com/contact

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared O6 Automation
O6 Automation open62541
Vendors & Products O6 Automation
O6 Automation open62541
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a remote attacker to trigger an out-of-bounds write.
Title o6 Automation open62541 Integer Overflow or Wraparound
Weaknesses CWE-190
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Aug 24, 2026, 5:52 PM
Reserved
Jul 27, 2026, 3:02 PM
Status
Awaiting Analysis
Published
Jul 30, 2026, 11:16 PM
Modified
Oct 23, 2026, 11:10 PM