EUVD-2026-52967
GHSA-2mh5-cmr8-pwvp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Client connects over network with no attacker privileges needed; attacker operates a server; crash yields only availability impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.
AnalysisAI
Out-of-bounds read in open62541 1.5.5 allows a malicious OPC UA server to crash connecting clients via a crafted namespace array response. The flaw resides in the client-side connection handler responseReadNamespacesArray() in src/client/ua_client_connect.c, triggered during the namespace discovery phase of the OPC UA session establishment. With a CVSS availability impact of High and no privileges required on the attacker side, the practical effect is a remotely-induced denial of service against any open62541-based OPC UA client that connects to an attacker-controlled server. No public exploit identified at time of analysis.
Technical ContextAI
open62541 is a widely-used open-source implementation of the OPC UA (OPC Unified Architecture) communication protocol, written in C, targeting industrial control systems, SCADA environments, and industrial IoT devices. The vulnerable function responseReadNamespacesArray() is invoked on the client side during OPC UA session establishment to parse the list of namespace URIs returned by the server in a ReadResponse. An out-of-bounds read vulnerability (tagged as a buffer overflow class by ENISA EUVD-2026-52967) occurs when the function processes a server-supplied namespace array that exceeds expected bounds without adequate length validation, causing the client to read memory beyond the allocated buffer. The CWE was not formally assigned, but the Buffer Overflow tag and the description of an out-of-bounds read are consistent with CWE-125 (Out-of-bounds Read). The affected CPE is ambiguously listed as cpe:2.3:a:n/a:n/a, but the description and source code references explicitly identify open62541 version 1.5.5. Reference to example connection clients (client_connect.c, client_connect_loop.c) suggests the vulnerability affects any standard client connection pattern.
RemediationAI
No vendor-released patch has been identified at time of analysis; the disclosure references point to a GitHub issue and source file links at tag v1.5.5 rather than a tagged fix release or security advisory. Defenders should monitor the open62541 GitHub repository (https://github.com/open62541/open62541) for a patched release and apply it as soon as available. As a compensating control, restrict OPC UA client connections to only trusted, allowlisted server endpoints using network ACLs or OPC UA security policies with certificate-based mutual authentication - this prevents a client from connecting to an attacker-controlled server and eliminates the primary attack surface. Enabling OPC UA SecurityMode Sign or SignAndEncrypt with validated server certificates adds an authentication barrier that an attacker cannot trivially bypass. Organizations running open62541 in safety-critical or production OT environments should consider temporarily disabling automatic or untrusted server connections until a patch is available. Note that restricting connections to known endpoints does not eliminate risk if a trusted server is itself compromised.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today