CVE-2026-4453: 
vulnerability analysis and mitigation

CVE-2026-4453 is an integer overflow vulnerability in the Dawn graphics component of Google Chrome on macOS that allows a remote attacker to leak cross-origin data via a crafted HTML page. It affects Google Chrome versions prior to 146.0.7680.153 on Mac, as well as Microsoft Edge (Chromium-based). The vulnerability was reported by researcher "sweetchip" on February 27, 2026, and publicly disclosed on March 18–20, 2026, when Google released the patched stable channel update. It carries a CVSS v3.1 base score of 4.3 (Medium) and is rated High severity by Chromium's internal security team (Chrome Releases, Red Hat Bugzilla).

The root cause is an integer overflow (CWE-190) in Dawn, the cross-platform GPU graphics abstraction layer used by Chrome on macOS. When processing a specially crafted HTML page, the overflow condition in Dawn's graphics pipeline can be triggered remotely, causing the browser to read memory beyond intended boundaries and expose data from cross-origin contexts — a violation of the same-origin policy. The attack requires no privileges and no special configuration, but does require user interaction (visiting a malicious page). The vulnerability is tracked under Chromium issue 488400770 (Chrome Releases, Red Hat Bugzilla).

Successful exploitation allows a remote attacker to bypass the browser's same-origin policy and leak sensitive cross-origin data, potentially exposing session tokens, authentication cookies, or other private information from websites open in the same browser context. The impact is limited to confidentiality — there is no integrity or availability impact — and is scoped to macOS users running affected Chrome versions. While not a full remote code execution vulnerability, the data exfiltration capability poses a meaningful risk for users accessing sensitive web applications (Chrome Releases).

1. Reconnaissance: Identify macOS users running Google Chrome versions prior to 146.0.7680.153, which can be inferred through browser fingerprinting techniques on a controlled web page.
2. Craft malicious HTML page: Develop an HTML page that triggers the integer overflow in Chrome's Dawn graphics component, likely through specific WebGPU or graphics API calls that cause a wraparound in buffer size calculations.
3. Host and deliver the page: Host the crafted page on an attacker-controlled server and lure the target to visit it via phishing, malvertising, or a compromised website.
4. Trigger the overflow: When the victim loads the page in an affected Chrome version on macOS, the integer overflow in Dawn causes out-of-bounds memory reads that expose data from cross-origin contexts.
5. Exfiltrate cross-origin data: The leaked data (e.g., content from other open tabs or iframes) is transmitted back to the attacker's server via JavaScript-based side-channel reads or direct data exfiltration (Chrome Releases).

• Network: Unusual outbound HTTP/HTTPS requests from the browser to unknown external domains immediately after visiting an unfamiliar page; large or repeated data transfers to attacker-controlled infrastructure.
• Logs: Browser crash reports or GPU process errors referencing Dawn or WebGPU components in Chrome's internal logs (chrome://crashes).
• Process: Unexpected GPU helper process (Google Chrome Helper (GPU)) consuming abnormal memory or CPU on macOS; renderer process crashes associated with graphics operations.
• File System: Presence of suspicious cached web content or scripts referencing WebGPU/Dawn APIs in Chrome's cache directory (~/Library/Caches/Google/Chrome/).

Google has released a fix in Chrome stable channel version 146.0.7680.153 (Linux/Mac) and 146.0.7680.153/154 (Windows). Users should update Chrome immediately via Settings > Help > About Google Chrome or enable automatic updates. Microsoft Edge (Chromium-based) users should also apply the corresponding Edge update. As a temporary workaround, macOS users can disable WebGPU via Chrome flags (chrome://flags/#enable-unsafe-webgpu) or restrict access to untrusted websites until patching is complete (Chrome Releases, Microsoft MSRC).

The vulnerability was part of a broader Chrome stable channel update that patched 26 security issues, drawing coverage from multiple cybersecurity news outlets including GBHackers, CyberSecurityNews, and CyberPress, which highlighted the update's significance given the number of high-severity fixes. Security community attention was moderate, consistent with a data-leakage vulnerability rather than a remote code execution flaw. No notable individual researcher commentary beyond the original reporter (sweetchip) has been identified (GBHackers, CyberSecurityNews).