An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a
    TLS 1.3 session. (CVE-2026-34873)

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3a9536df40 advisory.

    Update to 3.6.6

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 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-10443c65e3 advisory.

    Update to 3.6.6


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 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-8c332fbf00 advisory.

    Update to 3.6.6

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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the d77bd2f5-34f0-11f1-bc6d-3c7c3fba4204 advisory.

    https://mbed-tls.readthedocs.io/en/latest/security-advisories/ reports:

Tenable has extracted the preceding description block directly from the FreeBSD 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.

  - An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a     TLS 1.3 session. (CVE-2026-34873)

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

ID	Name	Product	Family	Type	Severity
464934	Echo: mbedtls: security update to 3.6.6	Tenable Cloud Security	Echo Local Security Checks	Local	critical
464934	Echo: mbedtls: security update to 3.6.6	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	critical
310670	Fedora 44 : mbedtls (2026-3a9536df40)	Nessus	Fedora Local Security Checks	Local	critical
307409	Fedora 42 : mbedtls (2026-10443c65e3)	Nessus	Fedora Local Security Checks	Local	critical
307056	Fedora 43 : mbedtls (2026-8c332fbf00)	Nessus	Fedora Local Security Checks	Local	critical
305996	FreeBSD : Mbed TLS -- vulnerabilities (d77bd2f5-34f0-11f1-bc6d-3c7c3fba4204)	Nessus	FreeBSD Local Security Checks	Local	critical
304723	Linux Distros Unpatched Vulnerability : CVE-2026-34873	Nessus	Misc.	Local	critical

Detections

Analytics

CVE-2026-34873

critical

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical