CVE-2026-13601 | BDVDB-2026-343939 Detail
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact none, availability impact none. Attack vector: local.
Weaknesses#
- CWE-693 Protection Mechanism Failure
References#
- https://access.redhat.com/errata/RHSA-2026:47177
- https://access.redhat.com/errata/RHSA-2026:47178
- https://access.redhat.com/errata/RHSA-2026:54539
- https://access.redhat.com/errata/RHSA-2026:54540
- https://access.redhat.com/errata/RHSA-2026:54605
- https://access.redhat.com/errata/RHSA-2026:54624
- https://access.redhat.com/errata/RHSA-2026:54637
- https://access.redhat.com/errata/RHSA-2026:54666
- https://access.redhat.com/errata/RHSA-2026:57417
- https://access.redhat.com/security/cve/CVE-2026-13601
- https://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/
- https://bugzilla.redhat.com/show_bug.cgi?id=2494110
- https://gitlab.gnome.org/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639
- https://gitlab.gnome.org/GNOME/yelp/-/work_items/238
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13601.json
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.