PT-2026-53247 · Red Hat · Red Hat Enterprise Linux 10+4

Published 2026-06-29 · Updated 2026-06-29 · CVE-2026-13601

NVD

CVSS v3.1

7.1

High

Base vector

AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

Fix

Protection Mechanism Failure

Weakness Enumeration

CWE-693

Related Identifiers

CVE-2026-13601

Affected Products

Red Hat Enterprise Linux 10

Red Hat Enterprise Linux 6

Red Hat Enterprise Linux 7

Red Hat Enterprise Linux 8

Red Hat Enterprise Linux 9

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-13601 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2494110 · Note
• https://gitlab.gnome.org/GNOME/yelp/-/work_items/238 · Note
• https://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp · Note
• https://access.redhat.com/security/cve/CVE-2026-13601 · Note
• https://gitlab.gnome.org/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639 · Note