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

  - Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and
    normalizes user-supplied include paths without verifying that the result remains within the intended
    markdown directory, allowing crafted include paths to access files outside that directory when markdown
    files are processed using md.read(). This issue is fixed in version 3.3.0. (CVE-2026-59924)

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-340793a2f1 advisory.

    Update to 3.3.4

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 SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22655-1 advisory.

    This update for python-mistune fixes the following issues

    - CVE-2026-59922: quadratic-time parsing on long runs of some markers in `formatting.py` can lead to DoS     (bsc#1271117).
    - CVE-2026-59923: `HTMLRenderer.safe_url()` does not block percent-encoded javascript URIs and allows for     XSS       (bsc#1271119).
    - CVE-2026-59924: improper processing of user-supplied include paths in `Include.parse()` can lead to path     traversal       and arbitrary file reads (bsc#1271121).
    - CVE-2026-59925: quadratic-time parsing on long runs of some emphasis pairs in `inline_parser` can lead     to DoS       (bsc#1271125).
    - CVE-2026-59926: improper escaping in `render_admonition()` can lead to atribute injection and XSS     (bsc#1271127).
    - CVE-2026-59927: uncontrolled recursion when processing two markdown files that include each other can     lead to a DoS        (bsc#1271128).
    - CVE-2026-59928: quadratic-time parsing on long lists of repeated reference-link definitions in     `block_parser` can       lead to DoS (bsc#1271131).
    - CVE-2026-59929: HARMFUL_PROTOCOLS list misses legacy and chained schemes and allow arbitrary script     execution in       user agents (bsc#1271132).
    - CVE-2026-59930: the `toc` plugin and `TableOfContents` directive generate heading IDs with predictable     values and       allow for collisions with attacker-controlled `id=toc_N` content (bsc#1271082).

Tenable has extracted the preceding description block directly from the SUSE 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 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ea39a303cf advisory.

    Update to 3.3.4


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

  - Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and     normalizes user-supplied include paths without verifying that the result remains within the intended     markdown directory, allowing crafted include paths to access files outside that directory when markdown     files are processed using md.read(). This issue is fixed in version 3.3.0. (CVE-2026-59924)

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

An update of the python3 package has been released.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-0a9fbbfa6d advisory.

    Update to 3.3.4

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 openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21339-1 advisory.

    This update for python-mistune fixes the following issues

    - CVE-2026-59922: quadratic-time parsing on long runs of some markers in `formatting.py` can lead to DoS     (bsc#1271117).
    - CVE-2026-59923: `HTMLRenderer.safe_url()` does not block percent-encoded javascript URIs and allows for     XSS       (bsc#1271119).
    - CVE-2026-59924: improper processing of user-supplied include paths in `Include.parse()` can lead to path     traversal       and arbitrary file reads (bsc#1271121).
    - CVE-2026-59925: quadratic-time parsing on long runs of some emphasis pairs in `inline_parser` can lead     to DoS       (bsc#1271125).
    - CVE-2026-59926: improper escaping in `render_admonition()` can lead to atribute injection and XSS     (bsc#1271127).
    - CVE-2026-59927: uncontrolled recursion when processing two markdown files that include each other can     lead to a DoS        (bsc#1271128).
    - CVE-2026-59928: quadratic-time parsing on long lists of repeated reference-link definitions in     `block_parser` can       lead to DoS (bsc#1271131).
    - CVE-2026-59929: HARMFUL_PROTOCOLS list misses legacy and chained schemes and allow arbitrary script     execution in       user agents (bsc#1271132).
    - CVE-2026-59930: the `toc` plugin and `TableOfContents` directive generate heading IDs with predictable     values and       allow for collisions with attacker-controlled `id=toc_N` content (bsc#1271082).

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

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

ID	Name	Product	Family	Published	Updated	Severity
459292	Echo: mistune: security update to 3.3.0	Tenable Cloud Security	Echo Local Security Checks	10/2/2026	10/5/2026	medium
459292	Echo: mistune: security update to 3.3.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	10/2/2026	10/5/2026	medium
376819	Fedora 43 : python-mistune (2026-340793a2f1)	Nessus	Fedora Local Security Checks	11/6/2026	11/6/2026	critical
327587	SUSE SLES16 Security Update : python-mistune (SUSE-SU-2026:22655-1)	Nessus	SuSE Local Security Checks	7/17/2026	7/17/2026	medium
376834	Fedora 44 : python-mistune (2026-ea39a303cf)	Nessus	Fedora Local Security Checks	11/6/2026	11/6/2026	critical
325824	Linux Distros Unpatched Vulnerability : CVE-2026-59924	Nessus	Misc.	7/9/2026	11/12/2026	medium
334706	Photon OS 5.0: Python3 PHSA-2026-5.0-92-0947	Nessus	PhotonOS Local Security Checks	8/12/2026	11/2/2026	medium
375749	Fedora 45 : python-mistune (2026-0a9fbbfa6d)	Nessus	Fedora Local Security Checks	11/4/2026	11/4/2026	medium
327239	openSUSE 16 Security Update : python-mistune (openSUSE-SU-2026:21339-1)	Nessus	SuSE Local Security Checks	7/16/2026	7/16/2026	medium

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