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 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	Severity
328823	Amazon Linux 2 : yelp, --advisory ALAS2-2026-3821 (ALAS-2026-3821)	Nessus	Amazon Linux Local Security Checks	medium
327326	SUSE SLES15 Security Update : yelp (SUSE-SU-2026:3037-1)	Nessus	SuSE Local Security Checks	medium
327315	SUSE SLES12 Security Update : yelp (SUSE-SU-2026:3035-1)	Nessus	SuSE Local Security Checks	medium
327282	SUSE SLED15 / SLES15 Security Update : yelp (SUSE-SU-2026:3036-1)	Nessus	SuSE Local Security Checks	medium
326684	openSUSE 16 Security Update : yelp (openSUSE-SU-2026:21295-1)	Nessus	SuSE Local Security Checks	medium
324712	Linux Distros Unpatched Vulnerability : CVE-2026-13601	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-13601

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium