CVE-2026-11946CWE-770CWE-789

GetEndpoints Memory Exhaustion in open62541

High · published July 2, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
43.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00524 · 43.6th percentile
Weaknesses
CWE-770 · Allocation of Resources Without Limits or Throttling; CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-07-02T10:54Z
EPSS history
Timeline
  • 02 JUL 10:54Z
    GetEndpoints Memory Exhaustion in open62541
    cvelistv5