🛡️ CVE-2026-13601 — enterprise-linux

🟠 CVSS 7.1 — High ✅ No Known Exploit CWE-693 NVD
7.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-13601 is classified as CWE-693: Protection Mechanism Failure. A protection exists but does not cover the case at hand, so it can be worked around.

Affected software

CVE-2026-13601 is recorded against 2 packages.

  • enterprise-linux
  • yelp (fixed in 49.1)

Timeline and source

Published on 29 June 2026 and last revised on 3 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

access.redhat.com
access.redhat.com
access.redhat.com
blogs.gnome.org
bugzilla.redhat.com
gitlab.gnome.org
gitlab.gnome.org
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com
security.access.redhat.com

Details

Severity HIGH
CVSS Score 7.1
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CWE CWE-693
Public Exploit ✅ No
Source NVD
Published 2026-06-29
Updated 2026-08-11
Modified 2026-08-03

Affected Packages

Software From version Fixed in
enterprise-linux
yelp 49.1

References

Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2494110
Issue Tracking, Mitigation, Third Party Advisory https://gitlab.gnome.org/GNOME/yelp/-/work_items/238
Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2494110

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