CVE-2026-13601 json
Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclosure from flatpak applications
published 2026-06-29 4 mo ago modified 2026-11-04 4 d ago also EUVD-2026-40066
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 7%
- public exploits
- 0
- none known
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 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.
Patch / fix
- Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 2:3.28.1-2.el7_9
- Red Hat Red Hat Enterprise Linux 8 2:3.28.1-3.el8_10.2
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 2:3.28.1-3.el8_4.2
- Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 2:3.28.1-3.el8_4.2
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 2:3.28.1-3.el8_6.2
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 2:3.28.1-3.el8_6.2
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 2:3.28.1-3.el8_8.2
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 2:3.28.1-3.el8_8.2
- Red Hat Red Hat Enterprise Linux 9 2:40.3-3.el9_8.1
- Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 2:40.3-2.el9_2.2
- Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 2:40.3-2.el9_4.2
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 2:40.3-2.el9_6.2
- yelp Debian 12 42.2-1+deb12u2
- yelp Debian 13 42.2-4+deb13u1
- yelp Debian 14 49.1-1
debian advisories DEBIAN-CVE-2026-13601
- yelp Ubuntu 22.04 LTS 42.1-1ubuntu0.2
- yelp Ubuntu 24.04 LTS 42.2-1ubuntu0.24.04.2
- yelp Ubuntu 26.04 LTS 49.0-5ubuntu0.1
- yelp Ubuntu Pro 16.04 LTS 3.18.1-1ubuntu4+esm1
- yelp Ubuntu Pro 18.04 LTS 3.26.0-1ubuntu2+esm1
- yelp Ubuntu Pro 20.04 LTS 3.36.2-0ubuntu1.1+esm1
ubuntu advisories UBUNTU-CVE-2026-13601
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- yelp RHEL 9 2:40.3-3.el9_8.1
- yelp-libs RHEL 9 2:40.3-3.el9_8.1
- yelp RHEL 8 2:3.28.1-3.el8_10.2
- yelp-libs RHEL 8 2:3.28.1-3.el8_10.2
- yelp RHEL 7 ELS 2:3.28.1-2.el7_9
- yelp-libs RHEL 7 ELS 2:3.28.1-2.el7_9
- yelp RHEL 8.6 EUS_LONG_LIFE, RHEL 8.6 AUS 2:3.28.1-3.el8_6.2
- yelp-libs RHEL 8.6 EUS_LONG_LIFE, RHEL 8.6 AUS 2:3.28.1-3.el8_6.2
red hat advisories RHSA-2026:57417RHSA-2026:54666RHSA-2026:54637RHSA-2026:54624RHSA-2026:54605RHSA-2026:54540
- yelp SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 41.2-150400.3.6.1
- yelp SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 42.2-150600.3.6.1
- yelp SLES for SAP applications 16.0, SLES 16.0 42.3-160000.3.1
- yelp SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 3.20.1-7.6.1
suse advisories SUSE-SU-2026:3037-1SUSE-SU-2026:3036-1SUSE-SU-2026:3035-1SUSE-SU-2026:22625-1
- yelp openSUSE Leap 16.0 42.3-160000.3.1
opensuse advisories openSUSE-SU-2026:21295-1
- yelp AlmaLinux 8 2:3.28.1-3.el8_10.2
- yelp-libs AlmaLinux 8 2:3.28.1-3.el8_10.2
- yelp AlmaLinux 9 2:40.3-3.el9_8.1
- yelp-libs AlmaLinux 9 2:40.3-3.el9_8.1
almalinux advisories ALSA-2026:47177ALSA-2026:47178
- yelp Rocky Linux 9 2:40.3-3.el9_8.1
- yelp Rocky Linux 8 2:3.28.1-3.el8_10.2
rocky linux advisories RLSA-2026:47178RLSA-2026:47177
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-13601 updated cvss 7.1
yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from Flatpak Applications
-
Red Hat Enterprise Linux 6 yelpaffected: workaround, no fix planned “Out of support scope”
-
Red Hat CodeReady Linux Builder EUS (v.9.6) yelp-devel 40.3-2.el9_6.2, yelp-debuginfo 40.3-2.el9_6.2, yelp-debugsource 40.3-2.el9_6.2, yelp-libs-debuginfo 40.3-2.el9_6.2fixed: vendor fix RHSA-2026:54539
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Red Hat Enterprise Linux AppStream (v. 8) yelp 3.28.1-3.el8_10.2, yelp-libs 3.28.1-3.el8_10.2fixed: vendor fix RHSA-2026:47177
-
Red Hat Enterprise Linux AppStream (v. 9) yelp 40.3-3.el9_8.1, yelp-libs 40.3-3.el9_8.1fixed: vendor fix RHSA-2026:47178
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) yelp 3.28.1-3.el8_4.2, yelp-libs 3.28.1-3.el8_4.2fixed: vendor fix RHSA-2026:54605
-
Red Hat Enterprise Linux AppStream AUS (v.8.6) yelp 3.28.1-3.el8_6.2, yelp-libs 3.28.1-3.el8_6.2fixed: vendor fix RHSA-2026:54666
-
Red Hat Enterprise Linux AppStream E4S (v.8.8) yelp 3.28.1-3.el8_8.2, yelp-libs 3.28.1-3.el8_8.2fixed: vendor fix RHSA-2026:54624
-
Red Hat Enterprise Linux AppStream E4S (v.9.2) yelp 40.3-2.el9_2.2, yelp-libs 40.3-2.el9_2.2fixed: vendor fix RHSA-2026:54637
show 8 moreshow fewer
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Red Hat Enterprise Linux AppStream E4S (v.9.4) yelp 40.3-2.el9_4.2, yelp-libs 40.3-2.el9_4.2fixed: vendor fix RHSA-2026:54540
-
Red Hat Enterprise Linux AppStream EUS (v.9.6) yelp 40.3-2.el9_6.2, yelp-libs 40.3-2.el9_6.2fixed: vendor fix RHSA-2026:54539
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) yelp 3.28.1-3.el8_4.2, yelp-libs 3.28.1-3.el8_4.2fixed: vendor fix RHSA-2026:54605
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) yelp 3.28.1-3.el8_6.2, yelp-libs 3.28.1-3.el8_6.2fixed: vendor fix RHSA-2026:54666
-
Red Hat Enterprise Linux AppStream TUS (v.8.8) yelp 3.28.1-3.el8_8.2, yelp-libs 3.28.1-3.el8_8.2fixed: vendor fix RHSA-2026:54624
-
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) yelp-devel 40.3-3.el9_8.1, yelp-debuginfo 40.3-3.el9_8.1, yelp-debugsource 40.3-3.el9_8.1, yelp-libs-debuginfo 40.3-3.el9_8.1fixed: vendor fix RHSA-2026:47178
-
Red Hat Enterprise Linux CRB (v. 8) yelp-devel 3.28.1-3.el8_10.2, yelp-debuginfo 3.28.1-3.el8_10.2, yelp-debugsource 3.28.1-3.el8_10.2, yelp-libs-debuginfo 3.28.1-3.el8_10.2fixed: vendor fix RHSA-2026:47177
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Red Hat Enterprise Linux Server (v. 7 ELS) yelp 3.28.1-2.el7_9, yelp-libs 3.28.1-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) yelp-devel 3.28.1-2.el7_9, yelp-debuginfo 3.28.1-2.el7_9fixed: vendor fix RHSA-2026:57417
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
| CISA ADP | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
Affected products
- Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
- Red Hat Red Hat Enterprise Linux 6
- Red Hat Red Hat Enterprise Linux 7
Classification
- Weakness
-
- CWE-693 Protection Mechanism Failure
References
-
gitlab.gnome.org
/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639
patch
-
access.redhat.com
/errata/RHSA-2026:47177
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:47178
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:54539
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:54540
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:54605
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:54624
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:54637
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:54666
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:57417
vendor-advisory
-
access.redhat.com
/security/cve/CVE-2026-13601
vdb-entry, vendor-advisory
-
bugzilla.redhat.com
/show_bug.cgi?id=2494110
issue-tracking, vendor-advisory
-
security.access.redhat.com
/data/csaf/v2/vex/2026/cve-2026-13601.json
vendor-advisory
-
blogs.gnome.org
/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/
third-party-advisory
-
gitlab.gnome.org
/GNOME/yelp/-/work_items/238
issue-tracking, mitigation, third-party-advisory
Sources
- CVE List CVE-2026-13601
- NVD CVE-2026-13601
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.