PT-2026-53259 · Red Hat · Red Hat Openshift Dev Spaces

Published 2026-06-29 · Updated 2026-06-29 · CVE-2026-12856

NVD

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

A flaw was found in the vscode-java extension, which provides Java language support for Visual Studio Code. The extension incorrectly trusts all Markdown content in JavaDoc hovers, allowing a malicious Java file to include hidden commands. If a user clicks a specially crafted link within a JavaDoc hover popup, an attacker can execute arbitrary VS Code commands, which can lead to full system compromise in trusted workspaces.

Fix

Argument Injection

Weakness Enumeration

CWE-88

Related Identifiers

CVE-2026-12856

Affected Products

Red Hat Openshift Dev Spaces

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-12856 · Security Note
• https://github.com/redhat-developer/vscode-java/security/advisories/GHSA-7qv8-6qrw-3crv · Note
• https://access.redhat.com/security/cve/CVE-2026-12856 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2491278 · Note