CVE-2026-106206 in Chrome
Summary
by MITRE • 10/06/2026
Improper input validation in Mobile in Google Chrome on on iOS prior to 155.0.8059.39 allowed a remote attacker to obtain sensitive information via crafted network traffic. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an improper input validation flaw within the mobile version of Google Chrome for iOS, specifically affecting versions prior to 155.0.8059.39, represents a significant risk to user privacy and data integrity. This security issue stems from inadequate sanitization or verification mechanisms applied to network traffic inputs processed by the browser engine. When a remote attacker crafts specific network requests designed to exploit this weakness, they can bypass standard validation checks that are intended to restrict access to internal application states or sensitive memory structures. The Chromium project has classified this vulnerability with a medium security severity rating, indicating that while it may not allow for immediate code execution or full system compromise on its own, it provides an attacker with meaningful capabilities to窥探 (peek into) protected data spaces that should remain inaccessible during normal browsing operations.
From a technical perspective, the core of this flaw lies in how the browser handles parsed network payloads and internal state variables associated with web content rendering. Improper input validation often manifests as buffer over-reads or logic errors where boundary checks are either missing or incorrectly implemented. In the context of mobile browsers, which operate within sandboxed environments to isolate web pages from the host operating system, such flaws can sometimes allow a malicious webpage to read memory contents that belong to other processes or sensitive internal buffers. This capability enables the extraction of information that is not intended for public consumption, potentially including session tokens, authentication cookies, or data cached by previous browsing sessions. The exploitation vector relies on social engineering or drive-by download tactics where a victim visits a specially crafted website hosted by an attacker, triggering the vulnerable code path through automated network requests initiated by JavaScript or other web technologies embedded in the page.
The operational impact of this vulnerability is primarily centered around information disclosure and potential session hijacking scenarios. By obtaining sensitive information via crafted network traffic, an attacker can gain insights into a user's browsing habits, potentially identifying targeted accounts or services being accessed. If the disclosed data includes authentication credentials or session identifiers, the consequences escalate to unauthorized access against those services. This aligns with common attack patterns observed in modern web exploitation campaigns where initial footholds are established through information gathering rather than direct system compromise. The medium severity rating reflects that while the impact is significant for individual users, it generally requires user interaction and does not typically lead to remote code execution or kernel-level privileges on its own. However, when combined with other vulnerabilities or used in targeted attacks against high-value individuals, the risk profile increases substantially due to the potential for identity theft and financial loss.
To mitigate this vulnerability, organizations and individual users must ensure that Google Chrome is updated to version 155.0.8059.39 or later on iOS devices. This update contains patches that address the input validation logic errors within the browser engine, effectively closing the attack vector described in the advisory. Security administrators should implement automated patch management policies for mobile endpoints to ensure timely deployment of such fixes. Additionally, users can reduce their exposure by employing content blocking extensions and disabling JavaScript execution on untrusted sites where possible, although this may impact usability. From a defensive posture perspective, monitoring network traffic for anomalous patterns indicative of exploitation attempts can provide early warning signs in enterprise environments.
This vulnerability maps to CWE-20 Improper Input Validation within the Common Weakness Enumeration framework, which categorizes flaws resulting from insufficient checking or sanitization of user-supplied data before processing. In terms of offensive security tactics, this aligns with ATT&CK technique T1537 Transfer Data to Cloud Account, as the attacker utilizes crafted network traffic to exfiltrate sensitive information to an external location controlled by the adversary. Understanding these mappings helps in developing more robust detection rules and defensive strategies that focus on validating inputs at multiple layers of the application stack rather than relying solely on perimeter defenses. Continuous monitoring and rapid response to vendor security advisories remain critical components of maintaining a secure mobile browsing environment against evolving web-based threats.