CVE-2026-11030: Chrome Network Use-After-Free Vulnerability (CVSS 8.8)

Technical summary

This vulnerability is a use-after-free (CWE-416) in Chrome's Network subsystem. The defect allows an attacker to reference memory that has already been freed, potentially corrupting the heap. By sending specially crafted network traffic to a vulnerable browser instance, an attacker can manipulate the memory state and achieve arbitrary code execution. The attack requires network-level access to the target and user interaction, but no special privileges on the victim's system. The Chromium security team assigned it a Medium severity rating internally, though the CVSS 3.1 score of 8.8 (HIGH) reflects the confluence of remote exploitability, low attack complexity, high confidentiality/integrity/availability impact, and user interaction requirement.

Business impact

Successful exploitation could allow attackers to execute arbitrary code within the Chrome browser process, potentially leading to theft of sensitive data (passwords, cookies, browsing history), credential theft, malware infection, or lateral movement into the host system. For organizations relying on Chrome for sensitive work, this vulnerability poses a direct risk to data confidentiality and integrity. The requirement for user interaction limits mass automated attack scenarios but makes targeted spear-phishing campaigns viable.

Affected systems

Google Chrome prior to version 149.0.7827.53 is directly affected. Because Chrome runs on multiple operating systems, all instances across Windows, macOS, and Linux systems are in scope. The vulnerability does not directly impact the Linux kernel, Windows, or macOS kernels themselves, though those platforms' Chrome installations are vulnerable. Organizations with heterogeneous Chrome deployments across all three operating systems should treat all instances as requiring the patch.

Exploitability

Exploitation requires network-level access and user interaction, making it more targeted than a wormable vulnerability but still readily exploitable via web-based attack vectors. An attacker could host a malicious website and use social engineering or targeted phishing to lure users to it, or intercept network traffic if positioned on the network path. The low attack complexity means no special attack conditions are needed beyond sending the malicious traffic. As of the publication date, this vulnerability is not listed on the CISA KEV catalog, suggesting no known active exploitation in the wild at the time of disclosure, though this status may change.

Remediation

Users and administrators must update Chrome to version 149.0.7827.53 or later as soon as possible. Chrome's auto-update mechanism typically rolls out patches automatically, but verification that the browser is fully patched is recommended. Organizations managing Chrome deployments via policy should verify that their update channels and policies allow the patch to deploy without delay. No workarounds exist; patching is the only mitigation.

Patch guidance

Navigate to Chrome's About menu (Menu > Help > About Google Chrome on most systems) to trigger an immediate update check. The browser will download and install version 149.0.7827.53 or later and prompt for a restart. For enterprise deployments, verify your Chrome update policies allow automatic or rapid manual updates. If you maintain Chrome instances via configuration management, update your deployment packages to the patched version and roll out updates to all managed systems within 24–48 hours of patch availability. Verify post-patch that all instances report version 149.0.7827.53 or later via chrome://version.

Detection guidance

Monitor for Chrome browser versions below 149.0.7827.53 in your environment through endpoint management tools, asset inventory systems, or browser telemetry. Hunt for suspicious network traffic patterns that may indicate attempted exploitation (unexpected connections from browser processes to external IP ranges, unusual DNS queries, or network signatures matching the vulnerability profile). Review browser process crash logs and memory access violation events for anomalies coinciding with suspect network activity. Correlate browser crashes with user-reported incidents of unexpected behavior, as heap corruption may result in denial-of-service-like conditions (browser crashes) before full code execution.

Why prioritize this

This vulnerability merits high priority deployment due to its CVSS score of 8.8, remote exploitability, high impact on confidentiality and integrity, and prevalence of Chrome across the organization. Although KEV status is not active and internal Chromium severity is Medium, the real-world attack surface (web browsing) and user interaction requirement make it a credible near-term risk. The patch is straightforward and non-disruptive, making rapid deployment practical.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH) reflects: (1) Network-based attack vector with no privileges required, (2) Low attack complexity, (3) Required user interaction that is realistic in web-browsing scenarios, (4) High impact across confidentiality, integrity, and availability due to potential arbitrary code execution within the browser's trust boundary. The score appropriately weighs the remote, relatively easy exploitability against the significant impact, positioning this as a high-priority issue despite the lack of current active exploitation reports.

Frequently asked questions