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CVE-2026-11946

7.5 · HIGH

An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541.

Published Jul 2, 2026CWE-770EPSS 0.52%

Overview

CVE-2026-11946 is a high-severity vulnerability. It was published on July 2, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/open62541/open62541GitHubgithub.com/open62541/open62541/pull/8142GitHubgithub.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae

How CyberStrike helps

Frequently asked questions

What is CVE-2026-11946?

CVE-2026-11946 is a high-severity vulnerability. It was published on July 2, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-11946?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-11946?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-11946?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-11946 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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