Is CVE-2026-11946 actively exploited?

No active exploitation of CVE-2026-11946 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-11946 be exploited remotely?

Yes. CVE-2026-11946 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-11946?

CVE-2026-11946 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-11946

HIGH

CVE-2026-11946

CWE-770Published: July 2, 2026· Updated: Jul 2, 2026

7.5

CVSS v3.1

EPSS:0.39%probability of exploitation in 30 daysPercentile:30.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-11946 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.