Improper Restriction of Rendered UI Layers or Frames Affecting osbuild-composer-core package, versions <0:165.1-5.el9_8.alma.1


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.22% (14th percentile)

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  • Snyk IDSNYK-ALMALINUX9-OSBUILDCOMPOSERCORE-20535331
  • published6 Oct 2026
  • disclosed21 Sept 2026

Introduced: 21 Sep 2026

CVE-2026-27136  (opens in a new tab)
CWE-1021  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 osbuild-composer-core to version 0:165.1-5.el9_8.alma.1 or higher.
This issue was patched in ALSA-2026:69293.

NVD Description

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

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

CVSS Base Scores

version 3.1