Medium 5.9Published Jul 30, 2026

CVE-2026-63362o6 Automation open62541 Integer Underflow

Updated under an hour ago (Oct 28, 2026, 5:23 AM ET)

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It affects o6 Automation open62541. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for o6 Automation open62541

Exploited in the last 30 days

An unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet.

CVSS: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-191
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: icscert
NVD analysis: Awaiting Analysis
Record last updated: Jul 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

o6 Automation open62541 o6_automation:open62541 (from the name)	from 1.3.0 through 1.3.17; from 1.4.0 through 1.4.16; from 1.5.0 through 1.5.4; master	CNA record

References

References

https://www.o6-automation.com/contact
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
https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.