A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

fedora FEDORA-2026-8cbd9e2c8b: open62541-1.5.8-1.fc43

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-6d919ea521 advisory.

    Update to 1.5.8

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3fd073ad5b advisory.

    Update to 1.5.8

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function     UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation     results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made     public and could be used. The project closed the issue report, stating that this is not the official way     to report a security vulnerability. (CVE-2026-18784)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
346464	Fedora 44 : open62541 (2026-6d919ea521)	Nessus	Fedora Local Security Checks	Local	high
346462	Fedora 45 : open62541 (2026-3fd073ad5b)	Nessus	Fedora Local Security Checks	Local	high
332070	Linux Distros Unpatched Vulnerability : CVE-2026-18784	Nessus	Misc.	Local	medium

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