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

No advisories yet.

Fixes

Solution

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


Workaround

No workaround given by the vendor.

History

Fri, 06 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Open62541
Open62541 open62541
Vendors & Products Open62541
Open62541 open62541

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

Updated: 2026-02-06T12:04:57Z

Weaknesses