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CVE-2026-63035— o6 Automation open62541 Use After Free

Quick assessment

Affected
o6 Automation open62541
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open62541是Open62541团队开源的一个 OPC UA(OPC统一架构)的开源实现。 open62541 1.3.0版本至1.3.17版本、1.4.0版本至1.4.16版本和1.5.0版本至1.5.4版本存在资源管理错误漏洞，该漏洞源于TransferSubscriptions服务存在堆释放后重用，可能导致经过身份验证的攻击者造成拒绝服务或执行任意代码。

CVSS 8.1 · High EPSS 0.76% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-63035

Vulnerability Information
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Vulnerability Title
o6 Automation open62541 Use After Free
Source: CVE Program / CVE List V5
Vulnerability Description
A heap use-after-free vulnerability in the TransferSubscriptions service in open62541 may allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
open62541 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open62541是Open62541团队开源的一个 OPC UA(OPC统一架构)的开源实现。 open62541 1.3.0版本至1.3.17版本、1.4.0版本至1.4.16版本和1.5.0版本至1.5.4版本存在资源管理错误漏洞，该漏洞源于TransferSubscriptions服务存在堆释放后重用，可能导致经过身份验证的攻击者造成拒绝服务或执行任意代码。
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-2026-63035

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9402 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-63035

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Patches & Fixes for CVE-2026-63035 (4)

Vendor Advisories for CVE-2026-63035 (2)

Other References for CVE-2026-63035 (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-2026-63559 7.5 HIGH o6 Automation open62541 Integer Overflow or Wraparound
CVE-2026-63362 5.9 MEDIUM o6 Automation open62541 Integer Underflow

IV. Related Vulnerabilities

Same product: open62541
Same vendor: o6 Automation
Same weakness: CWE-416

V. Comments for CVE-2026-63035

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