CVE-2026-11256: Chrome GPU Integer Overflow Sandbox Escape Vulnerability

Technical summary

An integer overflow condition exists in the GPU rendering component of Google Chrome prior to version 149.0.7827.53. The vulnerability (CWE-125: Out-of-bounds Read) allows an attacker controlling the renderer process to craft specially formed HTML that triggers the overflow during GPU processing, resulting in out-of-bounds memory access. This memory corruption can be leveraged to escape the renderer sandbox and achieve code execution in the context of the browser process or system. The Chromium security team assigned this a Low severity rating internally, though the CVSS 3.1 metric reflects the high impact of successful sandbox escape (score 8.3).

Business impact

Sandbox escape in Chrome represents a significant escalation risk. While an attacker must first compromise the renderer process—typically via a separate vulnerability in JavaScript or image parsing—this GPU bug provides a way to break isolation and access user data, system resources, and other browser tabs without restriction. Organizations relying on Chrome's sandbox as a security boundary should treat this as part of a multi-stage attack chain. Exploitation requires user interaction and prior renderer compromise, reducing the likelihood of mass exploitation but increasing the severity for targeted attacks.

Affected systems

CVE-2026-11256 affects Google Chrome prior to version 149.0.7827.53. The vulnerability is platform-independent and impacts Chrome running on Windows, macOS, and Linux. Note that the listed vendor/product set includes the base operating systems (Windows, macOS, Linux kernel), indicating that Chrome's GPU handling may leverage OS-level GPU drivers; however, the vulnerability itself resides in Chrome's GPU code path. Organizations should focus patching efforts on Chrome itself and verify that GPU drivers are current.

Exploitability

Exploitation requires two conditions: (1) the attacker must already have control of Chrome's renderer process, typically obtained through a separate browser vulnerability; (2) the user must navigate to or interact with a malicious HTML page. This two-stage requirement and the need for user interaction (UI:R in the CVSS vector) limit widespread automated exploitation. However, spear-phishing campaigns or watering-hole attacks combining a renderer exploit with this GPU bug represent a realistic threat. No public exploit code or KEV listing exists at this time, reducing immediate opportunistic risk but not eliminating targeted use.

Remediation

Update Google Chrome to version 149.0.7827.53 or later immediately. Chrome's auto-update mechanism should deploy the patch automatically, but users should verify their version in Settings > About Chrome. For organizations with managed Chrome deployments, push the update through your device management system. No workarounds exist to disable GPU processing without severely degrading browser performance; patching is the only mitigation. Ensure GPU drivers on Windows and macOS are also up to date, as they may share related code paths.

Patch guidance

Google Chrome version 149.0.7827.53 and later contain the fix. Users on Windows, macOS, and Linux should update immediately. Chrome typically auto-updates in the background and prompts for restart; manually check chrome://version to confirm you are running 149.0.7827.53 or higher. For enterprise deployments, use your preferred update mechanism (WSUS for Windows, MDM for managed devices, or package managers on Linux) to enforce the patched version. Verify rollout is complete before considering this vulnerability remediated in your environment.

Detection guidance

Monitor for Chrome process crashes or GPU-related errors in your telemetry, as failed exploitation attempts may leave traces. Look for abnormal GPU memory allocation patterns or GPU process spawning. Endpoint detection and response (EDR) tools may alert on suspicious child processes spawned from the Chrome GPU process—a sign of post-sandbox-escape activity. Network-side detection is limited unless combined with other indicators; focus on monitoring Chrome version compliance across your fleet to ensure patched instances are running. Consider supplementary vulnerability scanning to identify any prior-stage renderer vulnerabilities that might precede exploitation of this GPU bug.

Why prioritize this

Although the Chromium team rated this Low severity due to the requirement for prior renderer compromise, the CVSS 8.3 HIGH score reflects the critical nature of sandbox escape. Any vulnerability that breaks Chrome's isolation is a high-priority patch target, as it undermines a core security model. Prioritize this for immediate patching, particularly for users handling sensitive data or accessing high-value targets. The attack chain (renderer compromise + GPU overflow) means this is often part of sophisticated attacks rather than mass-exploitation scenarios, but that does not lower its remediation urgency.

Risk score, explained

The CVSS 3.1 score of 8.3 (HIGH) is driven by high impact across confidentiality, integrity, and availability (C:H, I:H, A:H) once the sandbox is breached. The attack vector is network (AV:N), reflecting the fact that a malicious HTML page can trigger the bug. However, the complexity is high (AC:H), requiring specific conditions and user interaction (UI:R), and the scope is changed (S:C), meaning the impact extends beyond the vulnerable component. The score appropriately reflects that while exploitation is not trivial, successful sandbox escape is a critical outcome warranting urgent patching.

Frequently asked questions