CVE-2026-1301 MEDIUM

CVE-2026-1301: Out-of-bounds Write in o6 Automation GmbH Open62541

Vendor O6 Automation Gmbh

Product Open62541

Weakness CWE-787

Published February 5, 2026

Last update February 5, 2026

View on NVD All CVEs

CVSS base score

6.8/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction —

Confidentiality —

Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.

Key dates

02Disclosure timeline

February 5, 2026 CVE published

February 5, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-1301 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/787.html

Related vulnerabilities

CVE-2026-1301: Out-of-bounds Write in o6 Automation GmbH Open62541

01Description

02Disclosure timeline

03References

04Related CVE