CVE-2026-1301— Out-of-bounds Write in o6 Automation GmbH Open62541
Quick assessment
Affected
o6 Automation GmbH Open62541
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
o6 Automation Open62541是德国o6 Automation公司的一个工业自动化工具集。 o6 Automation Open62541存在缓冲区错误漏洞，该漏洞源于特制JSON消息可能导致解码器在身份验证前写入超出堆分配数组，可能导致进程崩溃和内存损坏。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-1301
Vulnerability Information
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Vulnerability Title
Out-of-bounds Write in o6 Automation GmbH Open62541
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
o6 Automation Open62541 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
o6 Automation Open62541是德国o6 Automation公司的一个工业自动化工具集。 o6 Automation Open62541存在缓冲区错误漏洞，该漏洞源于特制JSON消息可能导致解码器在身份验证前写入超出堆分配数组，可能导致进程崩溃和内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| o6 Automation GmbH | Open62541 | 1.5-rc1 ~ 1.5-rc2 | - |
|
II. Public POCs for CVE-2026-1301
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Same weakness: CWE-787
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V. Comments for CVE-2026-1301
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