CVE-2026-12856 | A flaw was found in the vscode-java extension, which provide… | CVSS 8.8 HIGH

Description

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.

Metadata

CVE ID: CVE-2026-12856
State: PUBLISHED
Assigner: redhat
Reserved: 2026-06-22 06:09 UTC
Published: 2026-06-29 12:33 UTC
Last updated: 2026-06-29 14:52 UTC
Primary CWE: CWE-88
Improper Neutralization of Argument Delimiters in a Command …
Vendor / Product: Red Hat / Red Hat OpenShift Dev Spaces
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Red Hat	Red Hat OpenShift Dev Spaces	—	—

Weakness (CWE)

CWE	Source	Description
CWE-88	cna	Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References (3)