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CVE-2026-11138: Uninitialized Use in ANGLE Leads to Cross-Origin Data Disclosure in Google Chrome
This vulnerability resides in the ANGLE (Almost Native Graphics Layer Engine) component of Google Chrome, an open-source translation layer that allows WebGL content to be rendered across different graphics APIs (such as DirectX, OpenGL, and Vulkan).
The root cause is a CWE-457: Use of Uninitialized Variable [6†L10-L12]. Within ANGLE’s shader compilation or rendering pipeline, a specific code path may be triggered by a malicious HTML page. This path fails to properly initialize a memory variable before it is subsequently read and returned to the renderer. The flaw stems from inadequate input validation and memory management practices in a critical component.
Because the variable is not assigned a value, it contains whatever stale data was previously in that memory location. When an attacker convinces a user to visit a specially crafted webpage, they can force the renderer to read this uninitialized memory [6†L10-L12]. The rendered output from the uninitialized data is then returned to the attacker-controlled JavaScript, allowing them to extract sensitive information across origin boundaries. This effectively breaks the browser’s Same-Origin Policy, a fundamental security control.
The attack does not grant code execution or privilege escalation; however, it directly compromises the confidentiality of user data. The attack vector is remote, requiring no local access. Crucially, active user interaction is required to trigger the issue.
DailyCVE Form:
Platform: Google Chrome
Version: <149.0.7827.53
Vulnerability : CWE-457
Severity: Medium (CVSS 6.5)
Date: 2026-06-04
Prediction: 2026-06-02
What Undercode Say:
Analytics & Discovery Metrics
Check Chrome version for CVE-2026-11138 detection
google-chrome --version
Scan browser user-agents in server logs for vulnerable versions
zgrep -h 'Chrome/1[0-4][0-9].' /var/log/nginx/access.log..gz | \
awk '{print $1, $12}' | sort | uniq -c
Query Chrome's Security Status via internal API (Edge-only)
curl -s "chrome://version/" | grep -i "149.0.7827.53"
Undercode Analysis Code Snippet
// Concept check: Attempt to trigger uninitialized WebGL variable
const canvas = document.createElement('canvas');
const gl = canvas.getContext('webgl');
if (gl) {
// Force shader compilation without proper init
const shader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(shader, <code>uniform sampler2D uSampler;
varying vec2 vUv;
void main() {
vec4 c = texture2D(uSampler, vUv);
// Non-initialized variable vulnerability in affected versions
vec4 uninit;
gl_FragColor = c + uninit;
}</code>);
gl.compileShader(shader);
}
Exploit:
The flaw allows remote data exfiltration by bypassing the Same-Origin Policy. An attacker would embed a crafted HTML page containing malicious JavaScript. The page uses WebGL API calls to invoke the uninitialized memory path within ANGLE. Because the memory contains cross-origin data from previously processed content, the attacker can read that data back through the rendered output.
There is no public evidence of this vulnerability being exploited in the wild; however, the low EPSS score (0.03%) suggests it is not yet actively exploited.
Protection:
- Immediate Update: Upgrade to Google Chrome version 149.0.7827.53 or higher. Apply the stable channel update released on June 2, 2026.
- Workaround: If an immediate update is not possible, launch Chrome with the `–disable-angle` flag. This instructs Chrome to use a fallback graphics path, thereby avoiding the vulnerable ANGLE library entirely.
Launch Chrome with ANGLE disabled as a temporary workaround google-chrome --disable-angle
- Enterprise Policy: Administrators can enforce minimum required browser versions using group policies to prevent vulnerable versions from accessing organizational resources.
Impact:
Successful exploitation leads to a breach of confidentiality; a remote attacker can leak cross-origin data, potentially accessing sensitive information that should be isolated by the browser’s security model. The impact is rated as HIGH for confidentiality, with no impact on integrity or availability. The overall CVSS base score is 6.5 (Medium), with the attack complexity considered LOW and privileges required set to NONE.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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