CVE-2026-12856 Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the vscode-java extension
Attackers can execute arbitrary VS Code commands via malicious JavaDoc links, potentially leading to full system compromise in trusted workspaces.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-12856?
CVE-2026-12856 is a high-severity command injection vulnerability in Red Hat OpenShift Dev Spaces 3.29, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-88
Which versions are affected by CVE-2026-12856?
It affects 1 product.
Products include Redhat Openshift Dev Spaces.
How do I fix CVE-2026-12856?
No fix has been published for CVE-2026-12856 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-12856 being exploited?
There is no known exploitation of CVE-2026-12856 in the wild and no public exploit code.
Sources
Also known as GHSA-7vqr-7r5j-c84j.