CVE-2026-12856

Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the vscode-java extension

CVSS 8.8 HIGHCWE-88

Vexday Risk Score

18Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.8EPSS —KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

29 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

Red Hat · Red Hat OpenShift Dev Spaces

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References

https://access.redhat.com/security/cve/CVE-2026-12856 https://bugzilla.redhat.com/show_bug.cgi?id=2491278 https://github.com/redhat-developer/vscode-java/security/advisories/GHSA-7qv8-6qrw-3crv