CVE-2026-17956 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Scheduling 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: Low)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical sandbox escape flaw in Google Chrome's scheduling component that existed prior to version 151.0.7922.72. The issue stems from an improper implementation of the scheduling mechanism that allows remote attackers to bypass the browser's security boundaries and execute arbitrary code within the sandboxed environment. The vulnerability falls under the category of inadequate input validation and improper access control, which are commonly associated with CWE-284 access control flaws and CWE-787 out-of-bounds write conditions. Attackers could craft malicious HTML pages that exploit this weakness to escalate privileges and gain unauthorized code execution capabilities within the browser's restricted environment.
The technical implementation flaw occurs within Chrome's scheduling subsystem where the system fails to properly validate or sanitize input parameters that control task execution within the sandboxed context. This vulnerability enables attackers to manipulate the scheduling behavior in such a way that they can execute malicious code with elevated privileges, effectively breaking down the security isolation that the sandbox is designed to maintain. The low severity classification according to Chromium's security scoring system belies the actual impact, as this type of sandbox escape vulnerability can lead to complete system compromise when combined with other attack vectors. The flaw operates at the intersection of memory management and privilege escalation techniques, making it particularly dangerous in modern browser environments where sandboxing is a primary defense mechanism.
From an operational perspective, this vulnerability poses significant risks to users who browse the internet regularly, as it requires only a malicious webpage to trigger the exploit. The attack surface is broad since web pages are commonly visited and can be delivered through various channels including email attachments, compromised websites, or malicious advertisements. Successful exploitation could allow attackers to install malware, steal sensitive data, modify browser behavior, or use the compromised system as a launchpad for further attacks within the network. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059 command and control, T1078 legitimate credentials, and T1203 legitimate credentials, as it enables attackers to execute arbitrary code with browser privileges.
Mitigation strategies should focus on immediate patching of Chrome installations to version 151.0.7922.72 or later, which contains the necessary fixes for this vulnerability. Organizations should also implement additional security measures such as web content filtering, sandbox hardening configurations, and regular security assessments of browser environments. Browser hardening techniques including disabling unnecessary features, implementing strict content security policies, and using security extensions can provide additional defense layers. Network monitoring solutions should be configured to detect anomalous behavior patterns that might indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date software versions and demonstrates how seemingly minor implementation flaws in core browser components can have significant security implications. Regular security audits and penetration testing of browser environments are essential to identify and remediate similar vulnerabilities before they can be exploited by threat actors.