It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1583 advisory.

    When folding a long comment in an email header containing exclusively unfoldable characters, the     parenthesis would not be preserved. This could be used for injecting headers into email messages where     addresses are user-controlled and not sanitized. (CVE-2025-11468)

    User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in     the data URL mediatype. (CVE-2025-15282)

    When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP     headers into messages. Patch rejects all control characters within cookie names, values, and parameters.
    (CVE-2026-0672)

    User-controlled header names and values containing newlines can allow injecting HTTP headers.
    (CVE-2026-0865)

    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)

    The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled     in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers     for this audit event therefore do not fire. (CVE-2026-2297)

    When an Expat parser with a registered ElementDeclHandler parses an inlinedocument type definition     containing a deeply nested content model a C stackoverflow occurs. (CVE-2026-4224)

    The webbrowser.open() API would accept leading dashes in the URL whichcould be handled as command line     options for certain web browsers. Newbehavior rejects leading dashes. Users are recommended to sanitize     URLsprior to passing to webbrowser.open(). (CVE-2026-4519)

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

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

Detections

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Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1583)

high Nessus Plugin ID 306206

Version 1.2