CVE-2026-11946

HighCVSS 7.5/10Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-770 CWE-789

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
open62541 project / o6 Automation GmbH	open62541	>= 1.4.0, <= 1.4.16; >= 1.5.0, <= 1.5.4; master

References

Timeline

Published: Jul 2, 2026
Last modified: Oct 25, 2026
NVD status: Awaiting Analysis

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