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.

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Advisories

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Fixes

Solution

o6 Automation GmbH recommends users upgrade to the stable release of v1.5.0.


Workaround

No workaround given by the vendor.

History

Thu, 05 Feb 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 05 Feb 2026 19:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Out-of-bounds Write in o6 Automation GmbH Open62541
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 6.8, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2026-02-05T20:23:12.378Z

Reserved: 2026-01-21T18:52:45.866Z

Link: CVE-2026-1301

cve-icon Vulnrichment

Updated: 2026-02-05T20:23:06.601Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-05T19:15:55.983

Modified: 2026-02-05T20:47:37.777

Link: CVE-2026-1301

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses