A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests. This may result in the unauthorized disclosure of sensitive information.

The remote MiracleLinux 9 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2026-1537:02 advisory.

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:54666 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:54605 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:54540 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:54637 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:54624 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:54539 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2026:0240 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2026-13601:
    A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided     by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By     embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can     bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose     arbitrary user-readable host files through remote CSS resource requests. This may result in the     unauthorized disclosure of sensitive information.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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 AlmaLinux 9 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:47178 advisory.

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2026-1429:01 advisory.

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:47178 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:47178 advisory.

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

Tenable has extracted the preceding description block directly from the RockyLinux 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 RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:47177 advisory.

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:47177 advisory.

    Yelp is the help browser for the GNOME desktop. It is designed to help you browse all the documentation on     your system in one central tool, including traditional man pages, info pages and documentation written in     DocBook.

    Security Fix(es):

    * yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from     Flatpak Applications (CVE-2026-13601)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-47178 advisory.

    [2:40.3-3.1]
    - Fix CVE-2026-13601 (RHEL-190224)

Tenable has extracted the preceding description block directly from the Oracle Linux 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 Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-47177 advisory.

    [2:3.28.1-3.2]
    - Fix CVE-2026-13601 (RHEL-190226)

Tenable has extracted the preceding description block directly from the Oracle Linux 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 version of yelp installed on the remote host is prior to 3.28.1-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3821 advisory.

    A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided     by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By     embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can     bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose     arbitrary user-readable host files through remote CSS resource requests. This may result in the     unauthorized disclosure of sensitive information. (CVE-2026-13601)

Tenable has extracted the preceding description block directly from the tested product 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 SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:3037-1 advisory.

    This update for yelp fixes the following issue

    - CVE-2026-13601: overly permissive Content Security Policy allows host file disclosure via Flatpak     applications (bsc#1269625).

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2026:3035-1 advisory.

    This update for yelp fixes the following issue

    - CVE-2026-13601: overly permissive Content Security Policy allows host file disclosure via Flatpak     applications (bsc#1269625).

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:3036-1 advisory.

    This update for yelp fixes the following issue

    - CVE-2026-13601: overly permissive Content Security Policy allows host file disclosure via Flatpak     applications (bsc#1269625).

Tenable has extracted the preceding description block directly from the SUSE 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 openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:21295-1 advisory.

    This update for yelp fixes the following issue

    - CVE-2026-13601: overly permissive Content Security Policy allows host file disclosure via Flatpak     applications       (bsc#1269625).

Tenable has extracted the preceding description block directly from the SUSE 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided     by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By     embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can     bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose     arbitrary user-readable host files through remote CSS resource requests. This may result in the     unauthorized disclosure of sensitive information. (CVE-2026-13601)

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

ID	Name	Product	Family	Type	Severity
335337	MiracleLinux 9 : yelp-40.3-3.el9_8.1 (AXSA:2026-1537:02)	Nessus	Miracle Linux Local Security Checks	Local	medium
335254	RHEL 8 : yelp (RHSA-2026:54666)	Nessus	Red Hat Local Security Checks	Local	medium
335253	RHEL 8 : yelp (RHSA-2026:54605)	Nessus	Red Hat Local Security Checks	Local	medium
335215	RHEL 9 : yelp (RHSA-2026:54540)	Nessus	Red Hat Local Security Checks	Local	medium
335177	RHEL 9 : yelp (RHSA-2026:54637)	Nessus	Red Hat Local Security Checks	Local	medium
335172	RHEL 8 : yelp (RHSA-2026:54624)	Nessus	Red Hat Local Security Checks	Local	medium
335168	RHEL 9 : yelp (RHSA-2026:54539)	Nessus	Red Hat Local Security Checks	Local	medium
333569	Alibaba Cloud Linux 3 : 0240: yelp (ALINUX3-SA-2026:0240)	Nessus	Alibaba Cloud Linux Local Security Checks	Local	medium
333104	AlmaLinux 9 : yelp (ALSA-2026:47178)	Nessus	Alma Linux Local Security Checks	Local	medium
331866	MiracleLinux 8 : yelp-3.28.1-3.el8_10.2 (AXSA:2026-1429:01)	Nessus	Miracle Linux Local Security Checks	Local	medium
331745	RHEL 9 : yelp (RHSA-2026:47178)	Nessus	Red Hat Local Security Checks	Local	medium
331708	RockyLinux 9 : yelp (RLSA-2026:47178)	Nessus	Rocky Linux Local Security Checks	Local	medium
331706	RockyLinux 8 : yelp (RLSA-2026:47177)	Nessus	Rocky Linux Local Security Checks	Local	medium
331687	RHEL 8 : yelp (RHSA-2026:47177)	Nessus	Red Hat Local Security Checks	Local	medium
330606	Oracle Linux 9 : yelp (ELSA-2026-47178)	Nessus	Oracle Linux Local Security Checks	Local	medium
330604	Oracle Linux 8 : yelp (ELSA-2026-47177)	Nessus	Oracle Linux Local Security Checks	Local	medium
328823	Amazon Linux 2 : yelp, --advisory ALAS2-2026-3821 (ALAS-2026-3821)	Nessus	Amazon Linux Local Security Checks	Local	medium
327326	SUSE SLES15 Security Update : yelp (SUSE-SU-2026:3037-1)	Nessus	SuSE Local Security Checks	Local	medium
327315	SUSE SLES12 Security Update : yelp (SUSE-SU-2026:3035-1)	Nessus	SuSE Local Security Checks	Local	medium
327282	SUSE SLED15 / SLES15 Security Update : yelp (SUSE-SU-2026:3036-1)	Nessus	SuSE Local Security Checks	Local	medium
326684	openSUSE 16 Security Update : yelp (openSUSE-SU-2026:21295-1)	Nessus	SuSE Local Security Checks	Local	medium
324712	Linux Distros Unpatched Vulnerability : CVE-2026-13601	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-13601

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium