CVE-2026-13601
Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclosure from flatpak applications
CVSS Score
7.1
EPSS Score
0.1%
EPSS Percentile
3th
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.
| CWE | CWE-693 |
| Vendor | red hat |
| Product | red hat enterprise linux 7 extended lifecycle support |
| Published | Jun 29, 2026 |
| Last Updated | Aug 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:47177 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:47178 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:54539 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:54540 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:54605 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:54624 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:54637 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:54666 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:57417 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-13601 blogs.gnome.org: https://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/ bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2494110 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/yelp/-/work_items/238 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13601.json
Credits
Red Hat would like to thank Codean Labs for reporting this issue.