CVE-2026-11946 (GCVE-0-2026-11946)

Vulnerability from cvelistv5 – Published: 2026-07-02 10:54 – Updated: 2026-07-02 12:15
VLAI
Title
GetEndpoints Memory Exhaustion in open62541
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-02 12:15 UTC
CWE
  • CWE-770 - Allocation of resources without limits or throttling
  • CWE-789 - Memory allocation with excessive size value
Assigner
References
Impacted products
Vendor Product Version CPE status
open62541 project / o6 Automation GmbH open62541 Affected: 1.4.0 , ≤ 1.4.16 (semver)
Affected: 1.5.0 , ≤ 1.5.4 (semver)
Affected: master (custom)
guessed Create a notification for this product.
Credits
Lorenzo Cannella from Fondazione Ugo Bordoni (FUB)
Show details on NVD website
To clipboard 

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