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CVE-2026-12856— Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the vscode-java extension

Quick assessment

Affected
Red Hat Red Hat OpenShift Dev Spaces 3.29
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Red Hat Language support for Java ™ for Visual Studio Code是美国Red Hat公司的一款Java语言支持扩展。 Red Hat Language support for Java ™ for Visual Studio Code存在命令注入漏洞，该漏洞源于vscode-java扩展错误信任JavaDoc悬停中的所有Markdown内容，允许恶意Java文件包含隐藏命令，如果用户点击JavaDoc悬停弹出窗口中的特制链接，攻击者可以执行任意VS Co

CVSS 8.8 · High EPSS 0.55% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Red Hat OpenShift Dev Spaces 3.29 1782989367< * unaffected
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I. Basic Information for CVE-2026-12856

Vulnerability Information
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Vulnerability Title
Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the vscode-java extension
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
参数注入或修改
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Language support for Java ™ for Visual Studio Code 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Language support for Java ™ for Visual Studio Code是美国Red Hat公司的一款Java语言支持扩展。 Red Hat Language support for Java ™ for Visual Studio Code存在命令注入漏洞，该漏洞源于vscode-java扩展错误信任JavaDoc悬停中的所有Markdown内容，允许恶意Java文件包含隐藏命令，如果用户点击JavaDoc悬停弹出窗口中的特制链接，攻击者可以执行任意VS Co
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat OpenShift Dev Spaces 3.29 1782989367 ~ * cpe:/a:redhat:openshift_devspaces:3.29::el9

II. Public POCs for CVE-2026-12856

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8154 chars
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III. Intelligence Information for CVE-2026-12856

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Vendor Advisories for CVE-2026-12856 (4)

Same Patch Batch · Red Hat · 2026-06-29 · 7 CVEs total

CVE-2026-12912 7.3 HIGH Libtiff: libtiff: heap-based buffer overflow via crafted pixarlog-compressed tiff image
CVE-2026-13601 7.1 HIGH Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclos
CVE-2026-13595 6.8 MEDIUM Util-linux: util-linux: heap use-after-free in libblkid nested partition probing
CVE-2026-13757 6.2 MEDIUM P11-kit: stack exhaustion via unbounded recursion in rpc attribute parsing
CVE-2026-57965 5.1 MEDIUM Spice-vdagent: integer overflow in udscs_write() leading to heap buffer overflow
CVE-2026-57966 4.4 MEDIUM Spice-vdagent: path traversal in file transfer via unsanitized filename

IV. Related Vulnerabilities

Same vendor: Red Hat
Same weakness: CWE-88

V. Comments for CVE-2026-12856

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