---
id: CVE-2026-13601
title: >-
  A flaw was found in Yelp due to an overly permissive Content Security Policy
  (CSP) implementation provided by yelp-xsl
summary: >-
  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 C…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-693
  - CWE-693
vendor: gnome
product: yelp
affected:
  - enterprise_linux = 6.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - yelp < 49.1
patched:
  - yelp 49.1
published: '2026-06-29'
updated: '2026-08-03'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-13601'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:47177'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-13601'
    label: secalert@redhat.com
  - url: >-
      https://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2494110'
    label: secalert@redhat.com
  - url: >-
      https://gitlab.gnome.org/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639
    label: secalert@redhat.com
  - url: 'https://gitlab.gnome.org/GNOME/yelp/-/work_items/238'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-13601'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2494110'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13601.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00179
epssPercentile: 0.06677
ingestedAt: '2026-08-03T08:24:01.818Z'
---

## Overview

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.

## Affected

- `enterprise_linux = 6.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `yelp < 49.1`

## Remediation

Upgrade past the affected range:

- `yelp 49.1`