PT-2026-66619 · O6 Automation · Open62541

Asher Davila · CVE-2026-63559 · Published 2026-07-30 · Updated 2026-07-30

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

An integer overflow in the UA Variant arrayDimensions product computation in open62541 may allow a remote attacker to read out-of-bounds heap memory, potentially disclosing sensitive information.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-63559

Affected Products

Open62541

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-63559 · Security Note
• https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f · Note
• https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df · Note
• https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e · Note
• https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 · Note
• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json · Note
• https://o6-automation.com/contact · Note
• https://cisa.gov/news-events/ics-advisories/icsa-26-211-08 · Note