CVE-2026-13601

Publication date 29 June 2026

Last updated 17 August 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.1 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
yelp 26.04 LTS resolute
Fixed 49.0-5ubuntu0.1
25.10 questing Ignored end of life, was needed
24.04 LTS noble
Fixed 42.2-1ubuntu0.24.04.2
22.04 LTS jammy
Fixed 42.1-1ubuntu0.2
20.04 LTS focal
Fixed 3.36.2-0ubuntu1.1+esm1
18.04 LTS bionic
Fixed 3.26.0-1ubuntu2+esm1
16.04 LTS xenial
Fixed 3.18.1-1ubuntu4+esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
yelp

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.1 · High

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references

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