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

  - The email module, specifically the BytesGenerator class, didn't properly quote newlines for email     headers when serializing an email message allowing for header injection when an email is serialized. This     is only applicable if using LiteralHeader writing headers that don't respect email folding rules, the     new behavior will reject the incorrectly folded headers in BytesGenerator. (CVE-2026-1299)

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

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Linux Distros Unpatched Vulnerability : CVE-2026-1299

medium Nessus Plugin ID 296421

Version 1.6