CVE-2026-11109: ANGLE Uninitialized Use Data Leak in Chrome – Patch Guidance

Technical summary

CVE-2026-11109 is an uninitialized variable vulnerability (CWE-457) in the ANGLE graphics abstraction layer within Chromium. The flaw allows a remote, unauthenticated attacker to read data across origin boundaries by crafting malicious HTML that triggers uninitialized memory access during graphics processing. The vulnerability requires user interaction limited to visiting a webpage and results in confidentiality breach without integrity or availability impact. CVSS v3.1 score of 6.5 (Medium) reflects the high confidentiality impact, network-based attack vector, and low complexity, though successful exploitation requires social engineering to visit the attacker's page.

Business impact

Exploitation could expose sensitive information—such as authentication tokens, personal data, or proprietary content from other open tabs—to threat actors. For enterprises, this presents a data exfiltration risk if employees are socially engineered to visit attacker-controlled sites while authenticated to sensitive applications. The attack requires no special privileges or persistence mechanisms, making it a lower-cost vector for targeted reconnaissance or credential harvesting campaigns.

Affected systems

Google Chrome versions before 149.0.7827.53 on all supported platforms (Windows, macOS, Linux). The underlying ANGLE library is also present in other Chromium-based browsers, so products using outdated Chromium versions or bundled ANGLE components may be affected. Verify browser version and any applications embedding Chromium (such as Electron-based apps) for similar exposure.

Exploitability

Exploitation is straightforward from an attacker perspective: crafting a malicious HTML page that triggers the uninitialized memory access requires moderate technical skill but no zero-day tools. The attack is not in active exploitation tracked by CISA KEV as of the published date. However, the simplicity of delivery via social engineering (phishing, watering-hole attacks, or advertisement networks) means this type of vulnerability typically sees opportunistic exploitation once public. Successful exploitation depends on convincing the user to visit the attacker's page, not on browser sandbox escapes or system-level vulnerabilities.

Remediation

Update Google Chrome to version 149.0.7827.53 or later immediately. Chrome's auto-update mechanism will deploy the patch, but verify completion on all devices. For enterprises managing Chromium-based applications or corporate browsers, check release notes for Chromium 149 to confirm the fix is included in your deployment version and schedule rollout. No workarounds are available; patching is the only mitigation.

Patch guidance

Google Chrome will auto-update users to version 149.0.7827.53 or newer, typically within days of release. Administrators should verify patch deployment by checking chrome://version on deployed devices. For macOS managed environments using enterprise policies, confirm that automatic updates are enabled in your configuration profile. Linux administrators should pull the latest version from your distribution's package manager or from Google's official repository. Verify the update resolves the issue by checking the Chromium security advisory against your deployed version.

Detection guidance

Monitor Chrome version compliance across your endpoints using mobile device management (MDM) or endpoint detection and response (EDR) tools. Check for instances of Chrome versions prior to 149.0.7827.53 using asset inventory or browser telemetry. Behavioral detection is difficult at the endpoint level; focus on preventive patching rather than post-exploitation hunting. Network-level detection would require monitoring HTML pages for ANGLE-specific exploitation patterns, which is not practical. Prioritize rapid patching over detection.

Why prioritize this

Although rated Medium severity and not yet actively exploited at scale, the low exploitation barrier and ease of delivery via social engineering make this a near-term risk. Data exfiltration attacks targeting authentication tokens or sensitive information are operationally attractive to threat actors, and this vulnerability provides a low-cost vector. Rapid patching prevents both targeted and opportunistic exploitation. Organizations should treat this as a priority patch cycle item (within 2–4 weeks) rather than deferring to routine maintenance windows.

Risk score, explained

The CVSS 6.5 (Medium) score reflects a network-accessible, low-complexity attack that requires user interaction (visiting a webpage) but achieves high-impact confidentiality breaches. The score appropriately weights the social-engineering component and the restriction to confidentiality impact. However, the ease of exploitation via common web delivery mechanisms (phishing, ads, watering holes) means real-world risk may trend higher than the base score suggests; security teams should apply organizational context (employee click rates, sensitive data exposure, threat landscape) when prioritizing across multiple Medium-rated vulnerabilities.

Frequently asked questions