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CVE-2026-63362— o6 Automation open62541 Integer Underflow

Quick assessment

Affected
o6 Automation 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公司开源的一个实现工业控制通信协议的软件组件。 o6 Automation open62541 1.3.17及之前版本、1.4.16及之前版本和1.5.4及之前版本存在数字错误漏洞，该漏洞源于PubSub签名验证路径中的无符号整数下溢，可能导致远程攻击者通过特制UDP数据包造成拒绝服务。

CVSS 5.9 · Medium EPSS 1.82% · P78

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
o6 Automation open62541 1.3.0≤ 1.3.17 affected
1.4.0≤ 1.4.16 affected
1.5.0≤ 1.5.4 affected
master affected
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I. Basic Information for CVE-2026-63362

Vulnerability Information
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Vulnerability Title
o6 Automation open62541 Integer Underflow
Source: CVE Program / CVE List V5
Vulnerability Description
An unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
o6 Automation open62541 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
o6 Automation open62541是德国o6 Automation公司开源的一个实现工业控制通信协议的软件组件。 o6 Automation open62541 1.3.17及之前版本、1.4.16及之前版本和1.5.4及之前版本存在数字错误漏洞，该漏洞源于PubSub签名验证路径中的无符号整数下溢，可能导致远程攻击者通过特制UDP数据包造成拒绝服务。
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 open62541 1.3.0 ~ 1.3.17 -

II. Public POCs for CVE-2026-63362

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III. Intelligence Information for CVE-2026-63362

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Patches & Fixes for CVE-2026-63362 (4)

Vendor Advisories for CVE-2026-63362 (2)

Other References for CVE-2026-63362 (1)

Same Patch Batch · o6 Automation · 2026-07-30 · 4 CVEs total

CVE-2026-65423 8.8 HIGH o6 Automation open62541 Integer Overflow or Wraparound
CVE-2026-63035 8.1 HIGH o6 Automation open62541 Use After Free
CVE-2026-63559 7.5 HIGH o6 Automation open62541 Integer Overflow or Wraparound

IV. Related Vulnerabilities

Same product: open62541
Same vendor: o6 Automation
Same weakness: CWE-191

V. Comments for CVE-2026-63362

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