Cross-site Scripting (XSS) Affecting osbuild-composer package, versions <0:165.1-4.el9_8.1


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.31% (24th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL9-OSBUILDCOMPOSER-19716310
  • published13 Sept 2026
  • disclosed13 Aug 2026

Introduced: 13 Aug 2026

CVE-2026-56858  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade RHEL:9 osbuild-composer to version 0:165.1-4.el9_8.1 or higher.
This issue was patched in RHSA-2026:65153.

NVD Description

Note: Versions mentioned in the description apply only to the upstream osbuild-composer package and not the osbuild-composer package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

CVSS Base Scores

version 3.1