CVE-2026-79028 in Chrome
Summary
by MITRE • 08/26/2026
Observable discrepancy in Network in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an observable network discrepancy within the Chromium-based browser, specifically affecting versions of Google Chrome prior to 152.0.7977.65, represents a significant privacy and information leakage risk for end-users. This flaw stems from inconsistencies in how the browser handles or exposes network traffic metadata when processing specially crafted HTML content. Unlike traditional cross-site scripting attacks that aim to execute malicious code within the context of a trusted site, this vulnerability operates at the protocol and networking layer, allowing an attacker to infer sensitive data through side-channel analysis rather than direct extraction via script execution. The severity is classified as medium by Chromium security standards because while it does not typically lead to immediate remote code execution or full system compromise, it facilitates unauthorized surveillance of user activity and potentially exposes confidential information such as browsing history, search queries, or internal application states that were previously considered isolated from external observers.
From a technical perspective, the core issue lies in the browser's network stack behavior when rendering maliciously constructed web pages. Attackers can craft HTML documents containing specific elements or scripts designed to trigger distinct timing differences, DNS query patterns, or connection state changes observable by an adversary controlling a man-in-the-middle position or monitoring local network traffic. By analyzing these discrepancies, such as variations in packet sizes, response times, or the presence of certain headers, an attacker can deduce whether specific resources were loaded or if particular conditions within the browser's internal state are true. This technique leverages timing attacks and fingerprinting methodologies to reconstruct user behavior without needing direct access to the DOM or local storage, effectively bypassing standard same-origin policies that protect against data theft through script injection.
The operational impact of this vulnerability is primarily centered on privacy erosion and potential downstream security risks. Users browsing sensitive websites, such as online banking portals, healthcare applications, or corporate intranets, could have their activities monitored by network-level attackers who exploit these observable discrepancies to build detailed profiles of user behavior. In high-security environments, this can lead to the leakage of intellectual property or strategic information if employees are tricked into visiting malicious pages while connected to sensitive networks. Furthermore, such side-channel attacks can be combined with other vulnerabilities to escalate privileges or bypass security controls that rely on assumptions about network isolation and timing consistency. The ability to distinguish between different states through observable network artifacts undermines the fundamental trust model of web browsing where users expect their interactions to remain private from passive observers on the same network segment.
To mitigate this risk, organizations must prioritize immediate patching by upgrading Google Chrome to version 152.0.7977.65 or later, which addresses the underlying inconsistencies in the browser's networking implementation. In addition to software updates, deploying advanced threat protection solutions that inspect encrypted traffic for anomalies can help detect exploitation attempts based on unusual network patterns associated with side-channel attacks. Users should also be educated about the risks of visiting untrusted websites while connected to sensitive networks and encouraged to use private browsing modes or virtual environments when accessing critical applications from public Wi-Fi hotspots. Implementing strict Content Security Policies (CSP) can further reduce the attack surface by limiting the types of resources that can be loaded, thereby reducing the effectiveness of crafted HTML pages designed to trigger these observable discrepancies.
This vulnerability aligns with CWE-200, which covers Exposure of Sensitive Information to an Unauthorized Actor, as it allows for the indirect disclosure of user data through network observation rather than direct file access or memory dump. It also maps to MITRE ATT&CK technique T1537, specifically under the sub-technique of Communication Through Application Layer Protocol, where attackers use legitimate protocols and browser behaviors to exfiltrate information or gather intelligence without triggering traditional security alerts. Understanding this classification helps security teams better monitor for similar side-channel exploitation patterns in future incidents and refine detection rules to identify anomalous network behavior indicative of such sophisticated attacks.