CVE-2026-17661 in Chrome
Summary
by MITRE • 07/30/2026
Use after free in Loader in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical use-after-free condition within the loader component of google chrome browsers version prior to 151.0.7922.72. the flaw occurs when the browser processes maliciously crafted html content that triggers improper memory management during object deallocation. specifically, when a web page contains carefully constructed javascript or html elements that manipulate memory references in ways that violate standard memory safety protocols, the loader component fails to properly validate object lifecycles before allowing subsequent access to freed memory regions.
the technical execution of this vulnerability follows a classic use-after-free attack pattern where an attacker crafts an html page containing malicious code that creates conditions leading to memory corruption. when chrome processes such content, the loader module deallocates certain objects while concurrent operations may still reference those locations. this creates a window where an attacker can overwrite freed memory with controlled data, potentially redirecting execution flow through memory corruption techniques. the vulnerability is particularly dangerous because it operates within the browser's sandboxed environment yet allows privilege escalation to execute arbitrary code.
the operational impact of this vulnerability extends beyond typical web-based attacks as it represents a high-severity chromium security issue that enables remote code execution with sandbox escape capabilities. attackers can leverage this flaw by hosting malicious content on compromised websites or through phishing campaigns that deliver crafted html pages to unsuspecting users. the attack chain typically involves initial user interaction with the malicious page followed by memory corruption exploitation that bypasses standard browser security mechanisms including sandbox isolation, process isolation, and memory protection features.
this vulnerability maps directly to common weakness enumeration cwe-416 which specifically addresses use-after-free conditions in memory management. the attack vector aligns with attack technique t1059 from the mitre att&ck framework, representing command and scripting interpreter execution where an attacker utilizes browser-based scripting languages to manipulate memory states. additionally, it corresponds to defense evasion techniques through sandbox escape methods that allow attackers to bypass operating system security controls.
mitigation strategies for this vulnerability require immediate browser updates to version 151.0.7922.72 or later where google has implemented proper memory validation checks and improved deallocation procedures within the loader component. organizations should also implement network-level protections including web application firewalls that can detect and block suspicious html content patterns associated with known exploit signatures. browser hardening measures such as enabling sandboxing features, disabling unnecessary plugins, and implementing strict content security policies further reduce attack surface exposure. regular security assessments and vulnerability scanning should target memory management components to identify similar flaws before exploitation occurs.
the broader implications of this vulnerability highlight the ongoing challenges in web browser security where complex memory management systems can contain subtle flaws that enable sophisticated attacks. this particular issue demonstrates how seemingly minor implementation gaps in object lifecycle management can create significant security risks that span multiple attack vectors and compromise system integrity across different operating environments. organizations must maintain continuous vigilance through regular patch management, threat intelligence monitoring, and comprehensive security awareness training to protect against such critical vulnerabilities in browser-based environments.