CVE-2026-17907
Summary
by MITRE • 07/30/2026
Side-channel information leakage in Network in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a side-channel attack vector that exploited information leakage mechanisms within Google Chrome's network implementation prior to version 151.0.7922.72. The flaw allowed remote attackers to extract cross-origin data through carefully constructed HTML pages, demonstrating a significant security weakness in the browser's handling of network requests and their associated metadata. The vulnerability falls under the category of information leakage attacks where timing variations or other observable characteristics inadvertently reveal sensitive data about network operations across different origins.
The technical implementation of this flaw involved manipulating how Chrome processes network requests and responses, particularly in scenarios involving cross-origin resource sharing and request timing analysis. Attackers could craft HTML pages that would trigger specific network behaviors in the browser, then observe subtle timing differences or other measurable characteristics that would reveal information about data being transmitted or received from different origins. This type of vulnerability typically leverages the fact that modern browsers maintain complex internal state management for network operations, and certain implementation details can be inferred through careful observation of system behavior.
The operational impact of this vulnerability extends beyond simple data leakage to potentially enable more sophisticated attacks including cross-origin resource enumeration, user tracking across different domains, and information gathering that could aid in subsequent exploitation attempts. The low severity classification from Chromium security team indicates the attack requires specific conditions and may not directly lead to privilege escalation or complete system compromise, but it does represent a meaningful privacy and security concern. The vulnerability aligns with CWE-203: "Observable Behavioral Vulnerability" which specifically addresses issues where attacker-controlled inputs can cause observable changes in system behavior that leak information.
Attackers could potentially combine this side-channel weakness with other techniques to build more comprehensive reconnaissance capabilities, particularly in environments where multiple origins are accessed simultaneously. The vulnerability demonstrates the complexity of securing modern web browsers where numerous features must work together while maintaining proper isolation between different origins and security contexts. This type of attack follows patterns seen in the ATT&CK framework under the technique T1566: "Phishing" and related techniques involving information gathering and reconnaissance activities.
Mitigation strategies for this vulnerability primarily involve updating to the patched version of Chrome 151.0.7922.72 or later, which would address the underlying network processing behavior that enabled the side-channel information leakage. System administrators should ensure all browser installations are kept current with security patches, and organizations may want to consider implementing additional monitoring for unusual network behavior patterns that could indicate exploitation attempts. The fix likely involved modifying how Chrome handles network request timing and metadata exposure, ensuring that cross-origin requests do not leak observable characteristics that could be exploited for information gathering purposes.