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CVE-2026-35226— Out-of-bounds Write in CODESYS PROFINET Controller

Quick assessment

Affected
CODESYS CODESYS PROFINET
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.

CODESYS Profinet是德国CODESYS公司开源的一个工业以太网通讯协定。 CODESYS Profinet 4.4.0.0版本至4.8.0.0之前版本存在缓冲区错误漏洞，该漏洞源于越界写入，可能导致未经身份验证的攻击者发送畸形PROFINET通信数据，触发异常导致PLC应用程序受控停止。

CVSS 6.5 · Medium EPSS 0.28% · P18

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
CODESYS CODESYS PROFINET 4.4.0.0< 4.8.0.0 affected
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I. Basic Information for CVE-2026-35226

Vulnerability Information
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Vulnerability Title
Out-of-bounds Write in CODESYS PROFINET Controller
Source: CVE Program / CVE List V5
Vulnerability Description
An out‑of‑bounds write vulnerability in the CODESYS PROFINET Controller allows an unauthenticated attacker on the same network segment to send malformed PROFINET communication data that triggers an exception in the affected PLC application. The exception is handled by the CODESYS Control runtime system and results in a controlled stop of the PLC application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
CODESYS Profinet 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CODESYS Profinet是德国CODESYS公司开源的一个工业以太网通讯协定。 CODESYS Profinet 4.4.0.0版本至4.8.0.0之前版本存在缓冲区错误漏洞，该漏洞源于越界写入，可能导致未经身份验证的攻击者发送畸形PROFINET通信数据，触发异常导致PLC应用程序受控停止。
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
CODESYS CODESYS PROFINET 4.4.0.0 ~ 4.8.0.0 -

II. Public POCs for CVE-2026-35226

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III. Intelligence Information for CVE-2026-35226

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Vendor Advisories for CVE-2026-35226 (1)

IV. Related Vulnerabilities

Same vendor: CODESYS
Same weakness: CWE-787

V. Comments for CVE-2026-35226

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