Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-33592

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
02/07/2026
Last modified:
02/07/2026

Description

An unauthenticated remote attacker can exhaust<br /> server memory via the FindServers Discovery Service in open62541. The<br /> serverUris field of FindServersRequest is not validated for length or array<br /> size. An attacker can declare an arbitrarily large string (up to ~3.9 GB)<br /> delivered across intermediate chunks without ever sending the final chunk. The<br /> server buffers all chunks in RAM indefinitely until the SecureChannel times<br /> out. The attack is pre-session and bypasses all encryption configuration. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools