CVE-2026-11168: Chrome Extension Memory Disclosure Vulnerability

Technical summary

CVE-2026-11168 is a CWE-200 information disclosure vulnerability affecting Google Chrome prior to version 149.0.7827.53. The flaw exists in the Extensions subsystem where insufficient validation allows a compromised renderer process to access potentially sensitive data from process memory. An attacker would craft a malicious HTML page to trigger the memory disclosure. The vulnerability requires renderer process compromise as a prerequisite, making it part of a multi-stage attack chain rather than a standalone remote code execution vector. Chromium's security team classified this as Medium severity.

Business impact

This vulnerability represents a secondary-stage risk in a broader attack scenario. Organizations relying on Chrome for sensitive workflows face potential data exfiltration if an attacker first compromises the renderer process through another vector (such as a separate browser vulnerability or malicious content). The information disclosed could include session tokens, encryption keys, or user credentials. For enterprises managing Chrome at scale, this vulnerability underscores the importance of defense-in-depth strategies that limit the blast radius of a single component compromise. The requirement for renderer compromise before exploitation reduces but does not eliminate enterprise risk, particularly in environments where users visit untrusted websites or handle adversary-controlled content.

Affected systems

Google Chrome on Windows, macOS, and Linux systems are affected prior to version 149.0.7827.53. The vulnerability is specific to Chrome's implementation; while the underlying platforms (Windows, macOS, Linux) are listed as affected environments, the actual vulnerability is in Chrome itself. Organizations running older Chrome versions across any supported operating system should prioritize assessment. Chromebook users and enterprises using Chrome-based environments require immediate attention to browser version inventory.

Exploitability

Exploitation requires a two-step process: first, the attacker must compromise the Chrome renderer process through an unrelated vulnerability or attack vector, then craft and deliver the malicious HTML page to the compromised browser. This prerequisite significantly limits the exploitability window compared to direct remote code execution vulnerabilities. However, the CVSS score of 6.5 reflects the 'User Interaction Required' and network-based attack vector; once renderer compromise exists, the memory disclosure itself becomes highly reliable. The vulnerability has not been added to the CISA Known Exploited Vulnerabilities (KEV) catalog, indicating no evidence of in-the-wild exploitation at the time of publication. Security teams should monitor for evidence of renderer-targeting exploits that could serve as a precursor to this vulnerability chain.

Remediation

Immediate patching to Chrome version 149.0.7827.53 or later eliminates the vulnerability. Google's automatic update mechanism will deploy patches to most users within days; however, enterprises with update restrictions should test and deploy this version to managed Chrome installations without delay. No workarounds exist for unpatched systems; the only mitigation is to update. Organizations should verify patch deployment across all Chrome instances, including managed devices, kiosks, and specialized deployments that may fall outside standard update channels.

Patch guidance

Update Google Chrome to version 149.0.7827.53 or later. For enterprise deployments, verify patch application through Chrome policy reporting or device management console. Chrome typically auto-updates to the latest stable version; administrators should confirm this setting is enabled. Test patched versions in a pilot environment if your organization has strict change control procedures, then roll out enterprise-wide. Verify no critical extensions or web applications break after patching by conducting focused regression testing on high-value business processes. Monitor Chrome version across your fleet to confirm compliance.

Detection guidance

Monitor process memory dumps or forensic artifacts from Chrome instances for unexpected data access patterns involving the Extensions subsystem. Check for suspicious HTML pages accessed immediately before memory disclosure indicators. Endpoint detection and response (EDR) tools should flag unusual Chrome renderer process behavior, particularly spawning child processes or accessing sensitive memory regions. Log authentication events and session activity for anomalies that could indicate compromised credentials exfiltrated via this vulnerability. Network-level detection is limited because the attack operates within the browser process; focus on host-based indicators and memory analysis. Correlate renderer crashes or memory errors with suspicious web content access to identify potential exploitation attempts.

Why prioritize this

This vulnerability merits prompt but not emergency prioritization. The CVSS 6.5 score and the requirement for prior renderer compromise place it in the 'important' tier rather than 'critical.' However, the ease of exploitation once the prerequisite is met, combined with broad Chrome distribution across enterprises, justifies prioritizing this within 1–2 weeks of patch availability. Organizations with frequent zero-day renderer vulnerability disclosures or high-risk browsing activity should elevate priority. The lack of KEV listing is reassuring; prioritize based on your environment's exposure to other renderer-targeting vulnerabilities that could serve as the attack precursor.

Risk score, explained

The CVSS 6.5 (Medium) score reflects a network-based attack with low complexity that requires user interaction but does not require authentication or privileges. The attack vector is 'Network' because the malicious HTML is delivered remotely, and the consequence is high confidentiality impact with no integrity or availability loss. The score appropriately weighs the requirement for prior renderer compromise by assuming an attacker already has that foothold; it does not attempt to quantify the likelihood of achieving that initial compromise. The severity is Medium rather than High because memory disclosure alone, while dangerous, is less impactful than code execution or system-level compromise. However, in attack chains combining a renderer vulnerability with this flaw, the cumulative risk rises significantly.

Frequently asked questions