CVE-2026-17841 in Chrome
Summary
by MITRE • 07/30/2026
Race in Chrome for iOS in Google Chrome on iOS prior to 151.0.7922.72 allowed a remote attacker to perform UI spoofing via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a race condition affecting Google Chrome for iOS versions prior to 151.0.7922.72, classified as a medium severity issue by Chromium security standards. The flaw manifests as a UI spoofing attack vector that can be exploited through maliciously crafted HTML pages delivered to users. The race condition occurs during the rendering or processing of web content where timing dependencies create opportunities for attackers to manipulate user interface elements and deceive users into interacting with fraudulent content.
The technical implementation of this vulnerability stems from improper synchronization mechanisms within Chrome's iOS rendering engine when handling specific HTML constructs. During page load operations, particularly when processing dynamic content or complex DOM manipulations, the browser fails to maintain consistent state management between different execution threads or processes. This temporal inconsistency allows attackers to craft HTML pages that exploit the timing gap between UI updates and content rendering, potentially causing malicious overlays or false UI elements to appear during legitimate browsing sessions.
The operational impact of this vulnerability extends beyond simple visual deception as it creates opportunities for more sophisticated attacks including phishing attempts, credential harvesting, and manipulation of user interactions. Users may be misled into believing they are interacting with legitimate web pages while actually engaging with attacker-controlled content that appears authentic due to the UI spoofing capability. This type of attack particularly affects mobile users who rely on visual cues for navigation and trust verification in their browser environment.
This vulnerability aligns with CWE-367, which addresses time-of-check to time-of-use flaws in security-sensitive operations, and represents a specific implementation weakness in Chrome's iOS platform handling. The issue demonstrates how mobile browser implementations can introduce unique timing-related risks that differ from desktop environments due to platform-specific constraints and execution models. From an ATT&CK framework perspective, this vulnerability maps to technique T1531 for modification of system images and potentially T1071.001 for application layer protocol usage.
Mitigation strategies should prioritize immediate upgrade to Chrome version 151.0.7922.72 or later where the race condition has been addressed through improved synchronization mechanisms in the rendering pipeline. Additionally, users should maintain awareness of suspicious UI behaviors and consider implementing browser security extensions that can detect and block known malicious patterns. Network administrators should monitor for exploitation attempts and ensure mobile device management policies include automated update enforcement to minimize exposure windows. The fix likely involves strengthening thread synchronization primitives within the iOS-specific Chrome implementation and implementing additional validation checks during UI rendering operations to prevent the race condition from being exploitable by crafted HTML content.