CVE-2026-10886 in Chrome
Summary
by MITRE • 06/05/2026
Use after free in FileSystem in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)
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Analysis
by VulDB Data Team • 06/05/2026
This vulnerability represents a critical use-after-free flaw in the FileSystem API implementation within Google Chrome browsers prior to version 149.0.7827.53. The issue stems from improper memory management where a freed memory object is accessed after its lifecycle has ended, creating a potential pathway for arbitrary code execution. The vulnerability is classified as a use-after-free condition under CWE-416, which occurs when a program continues to reference memory after it has been freed, leading to undefined behavior and potential exploitation. The flaw specifically affects the FileSystem API component that handles file system operations within the browser's sandboxed environment, making it particularly dangerous as it could enable attackers to escape the browser sandbox and gain elevated privileges on the underlying system.
The technical exploitation of this vulnerability requires a remote attacker to craft a malicious HTML page that triggers the problematic code path in the FileSystem API. When the browser processes this crafted page, it causes a race condition or memory corruption scenario that results in the use-after-free condition. The attacker can leverage this condition to manipulate memory layout and potentially redirect execution flow to malicious code. This type of attack aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1548.002 for abuse of system permissions, as successful exploitation could allow for privilege escalation and system compromise. The Chromium security severity rating of Critical reflects the potential for full system compromise and the relatively straightforward exploitation path available to remote attackers.
The operational impact of this vulnerability extends beyond simple browser exploitation to encompass potential widespread system compromise across all affected Chrome installations. Organizations running older Chrome versions face significant risk as this vulnerability can be exploited through standard web browsing activities without requiring user interaction beyond visiting a malicious website. The sandbox escape capability means that even if the initial attack vector is blocked, the compromised browser could potentially be used to access sensitive files, execute arbitrary commands, or establish persistence mechanisms on the target system. This makes the vulnerability particularly dangerous in enterprise environments where Chrome is widely deployed and where users may inadvertently visit compromised websites. The memory corruption nature of the vulnerability also means that exploitation could potentially lead to denial of service conditions or information disclosure, further amplifying the security impact.
Mitigation strategies should prioritize immediate patching of Chrome installations to version 149.0.7827.53 or later, which contains the necessary memory management fixes for the FileSystem API. Organizations should implement network-based protections such as content filtering and web application firewalls to block access to known malicious domains. Browser hardening measures including disabling unnecessary FileSystem API access and implementing strict content security policies can reduce the attack surface. Security monitoring should focus on detecting unusual browser behavior patterns that might indicate exploitation attempts, including unexpected memory access patterns or sandbox escape indicators. Regular security assessments of browser configurations and user access controls should be conducted to ensure that the mitigation measures remain effective against evolving attack techniques. Additionally, user education programs should emphasize the importance of avoiding untrusted websites and keeping browser software updated to protect against known vulnerabilities.