Nessus leverages third-party software to help provide underlying functionality. One of the third-party components (OpenSSL) was found to contain vulnerabilities, and updated versions have been made available by the provider.
Out of caution and in line with best practice, Tenable has opted to upgrade these components to address the potential impact of the issues. Nessus 10.5.6 updates OpenSSL to version 3.0.12 to address the identified vulnerabilities.
Additionally, one other vulnerability was discovered, reported and fixed:
Under certain conditions, a low privileged attacker could load a specially crafted file during installation or upgrade to escalate privileges on Windows and Linux hosts. – CVE-2023-5847