cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to version 46.0.6, DNS name constraints were only validated against SANs within child certificates, and not the "peer name" presented during each validation. Consequently, cryptography would allow a peer named bar.example.com to validate against a wildcard leaf certificate for *.example.com, even if the leaf's parent certificate (or upwards) contained an excluded subtree constraint for bar.example.com. This issue has been patched in version 46.0.6.

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

  - cryptography is a package designed to expose cryptographic primitives and recipes to Python developers.
    Prior to version 46.0.6, DNS name constraints were only validated against SANs within child certificates,     and not the peer name presented during each validation. Consequently, cryptography would allow a peer     named bar.example.com to validate against a wildcard leaf certificate for *.example.com, even if the     leaf's parent certificate (or upwards) contained an excluded subtree constraint for bar.example.com. This     issue has been patched in version 46.0.6. (CVE-2026-34073)

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

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-2423902e8b advisory.

    Update to v46.0.6

        This includes a single fix for security issue:

        * **SECURITY ISSUE**: Fixed a bug where name constraints were not applied           to peer names during verification when the leaf certificate contains a           wildcard DNS SAN. Ordinary X.509 topologies are not affected by this bug,           including those used by the Web PKI. Credit to **Oleh Konko (1seal)** for           reporting the issue. **CVE-2026-34073**

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

Note that Nessus has not tested for this issue 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 a vulnerability as referenced in the FEDORA-2026-6c010af7be advisory.

    Update to v46.0.6

        This includes a single fix for security issue:

        * **SECURITY ISSUE**: Fixed a bug where name constraints were not applied           to peer names during verification when the leaf certificate contains a           wildcard DNS SAN. Ordinary X.509 topologies are not affected by this bug,           including those used by the Web PKI. Credit to **Oleh Konko (1seal)** for           reporting the issue. **CVE-2026-34073**


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

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

ID	Name	Product	Family	Severity
304412	Linux Distros Unpatched Vulnerability : CVE-2026-34073	Nessus	Misc.	medium
304258	Fedora 44 : python-cryptography (2026-2423902e8b)	Nessus	Fedora Local Security Checks	medium
304255	Fedora 43 : python-cryptography (2026-6c010af7be)	Nessus	Fedora Local Security Checks	medium

Detections

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CVE-2026-34073

medium

Tenable Plugins

medium

medium

medium