CVE-2026-79032 in Chrome
Summary
by MITRE • 08/26/2026
Improper input validation in Network in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions 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 improper input validation flaw within Google Chrome prior to version 152.0.7977.65 represents a significant breach in the browser's isolation mechanisms, specifically targeting the boundary between renderer processes and system-level resources. This issue stems from insufficient sanitization or type-checking of data inputs processed by the Network component, which is responsible for handling network requests and responses within the Chromium architecture. When an attacker crafts a malicious HTML page designed to exploit this specific validation gap, they can manipulate how the browser interprets certain parameters related to network operations. The core technical flaw lies in the failure to strictly enforce expected data formats or constraints before these inputs are passed deeper into the system's networking stack, allowing for unexpected behavior that deviates from secure design principles.
From an operational perspective, this vulnerability enables a remote attacker who has already compromised the renderer process to escalate their privileges and bypass critical system access restrictions. In modern web browsers like Chrome, each tab or site typically runs in its own sandboxed renderer process to limit the damage of potential exploits. However, if input validation is flawed within shared components such as the Network module, an attacker can leverage this weakness to interact with APIs or resources that should be inaccessible from a low-privilege context. This effectively breaks the sandbox boundary, allowing malicious scripts executed via the crafted HTML page to perform actions that require higher permissions, such as accessing sensitive system files or communicating directly with internal network services without proper authorization checks.
This type of vulnerability is commonly classified under CWE-20 Improper Input Validation in industry standards, which highlights the failure of a program to correctly validate input data before processing it. Furthermore, from an offensive security standpoint aligned with the MITRE ATT&CK framework, this exploit technique relates to techniques involving privilege escalation and sandbox escape, specifically those that leverage application logic flaws rather than memory corruption bugs like buffer overflows. The severity is rated as Medium by Chromium because while it requires a pre-condition of renderer compromise, the ability to bypass system access restrictions significantly increases the potential impact on user privacy and data integrity compared to standard cross-site scripting or content injection attacks.
To mitigate this risk, users must ensure that Google Chrome is updated to version 152.0.7977.65 or later, where these input validation checks have been hardened. For enterprise environments, implementing strict Content Security Policies can help restrict the execution of untrusted scripts and limit the attack surface available to attackers attempting to craft such malicious pages. Additionally, deploying browser isolation solutions or using specialized security extensions that monitor for anomalous network behavior from renderer processes can provide an additional layer of defense against exploits targeting these specific validation gaps in the networking stack.