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CVE-2026-11946— GetEndpoints Memory Exhaustion in open62541

Quick assessment

Affected
open62541 project / o6 Automation GmbH 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存在资源管理错误漏洞，该漏洞源于GetEndpoints Discovery Service中GetEndpointsRequest的endpointUrl字段未对长度进行验证，可能导致未经身份验证的远程攻击者通过发送中间数据块并利用UInt32长度字段声明任意大的字符串（最大约4.09 GB），服务器将所有数据块无限期保留在RAM中，直至安全通道超时，从而耗尽服务器内存。攻击发生在会话前并

CVSS 7.5 · High EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification

Affected Version Matrix 3

VendorProduct Version RangeStatus
open62541 project / o6 Automation GmbH open62541 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-2026-11946

Vulnerability Information
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Vulnerability Title
GetEndpoints Memory Exhaustion in open62541
Source: CVE Program / CVE List V5
Vulnerability Description
An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configurations. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
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存在资源管理错误漏洞，该漏洞源于GetEndpoints Discovery Service中GetEndpointsRequest的endpointUrl字段未对长度进行验证，可能导致未经身份验证的远程攻击者通过发送中间数据块并利用UInt32长度字段声明任意大的字符串（最大约4.09 GB），服务器将所有数据块无限期保留在RAM中，直至安全通道超时，从而耗尽服务器内存。攻击发生在会话前并
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
open62541 project / o6 Automation GmbH open62541 1.4.0 ~ 1.4.16 -

II. Public POCs for CVE-2026-11946

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12123 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-11946

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Patches & Fixes for CVE-2026-11946 (2)

IV. Related Vulnerabilities

Same product: open62541
Same vendor: open62541 project / o6 Automation GmbH
Same weakness: CWE-770

V. Comments for CVE-2026-11946

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