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No exploitation reportedFix available

CVE-2026-13601

Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclosure from flatpak applications

No exploitation reported by the sources we read.

  • Published2026-06-29
  • WeaknessCWE-693

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-06-2909:20CVE publishedCNA

Versions per branch

NVD
Redhat enterprise linux
BranchAffectedFixed in
6.0= 6.0no fix published
7.0= 7.0no fix published
8.0= 8.0no fix published
9.0= 9.0no fix published
Gnome yelp
BranchAffectedFixed in
49.1< 49.149.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA13 products

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

7 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-04

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • yelpUbuntu:Pro:20.04:LTSall versions · fixed in 3.36.2-0ubuntu1.1+esm1
  • yelpUbuntu:Pro:18.04:LTSall versions · fixed in 3.26.0-1ubuntu2+esm1
  • yelpUbuntu:Pro:16.04:LTSall versions · fixed in 3.18.1-1ubuntu4+esm1
  • yelpUbuntu:26.04:LTSall versions · fixed in 49.0-5ubuntu0.1
  • yelpUbuntu:25.10all versions · no fixed version listed
  • yelpUbuntu:24.04:LTSall versions · fixed in 42.2-1ubuntu0.24.04.2
  • yelpUbuntu:22.04:LTSall versions · fixed in 42.1-1ubuntu0.2
  • yelpTuxCare:AlmaLinux:9.6all versions · fixed in 2:40.3-2.el9_6.1.tuxcare.els1and 2 other packages

46 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-13601 Red Hat Product Security283 products fixed · 2 known affected

    yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from Flatpak Applications

    yelp as a component of Red Hat Enterprise Linux 6 · yelp.src as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:57417 Red Hat Product Security33 products fixed

    Red Hat Security Advisory: yelp security update

  • RHSA-2026:54666 Red Hat Product Security20 products fixed

    Red Hat Security Advisory: yelp security update

  • RHSA-2026:54637 Red Hat Product Security25 products fixed

    Red Hat Security Advisory: yelp security update

  • RHSA-2026:54624 Red Hat Product Security25 products fixed

    Red Hat Security Advisory: yelp security update

  • RHSA-2026:54605 Red Hat Product Security20 products fixed

    Red Hat Security Advisory: yelp security update

4 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:57417 · 33 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Workaround from the vendor Red Hat Product Security RHSA-2026:57417 · 33 productsNo mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the appropriate security update when they becomes available.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Published
2026-06-29
Last Modified
2026-11-04
NVD status
Modified
GitHub Advisory
GHSA-f4vh-qr53-q5gv

Frequently asked questions

What is CVE-2026-13601?

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.

Is CVE-2026-13601 actively exploited?

Active exploitation of CVE-2026-13601 has not been confirmed. Its EPSS score was 0.2% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-13601?

CVE-2026-13601 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

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