CVE-2026-1301 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

No data.

No data.

No data.

No data.

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.

References

Link	Providers
https://www.cisa.gov/news-events/ics-advisories/icsa-26-036-03

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		https://www.cisa.gov/news-events/ics-advisories/icsa-26-036-03
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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MITRE

Status: PUBLISHED

Assigner: icscert

Published: 2026-02-05T19:09:37.387Z

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

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

Link: CVE-2026-1301

Vulnrichment

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

NVD

Status : Awaiting Analysis

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

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

Link: CVE-2026-1301

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-787

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