CVE-2026-17856
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Network in Google Chrome on Mac prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape 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 critical sandbox escape flaw in Google Chrome's network implementation on macOS systems prior to version 151.0.7922.72. The issue stems from an improper handling of network-related operations within the browser's architecture that creates an exploitable path for remote attackers who have already compromised the renderer process. The vulnerability falls under the category of insufficient sandbox isolation, which is classified as CWE-254 in the Common Weakness Enumeration catalog and aligns with ATT&CK technique T1068 for local privilege escalation through sandbox bypass.
The technical implementation flaw occurs when a malicious HTML page triggers specific network operations that exploit a gap in Chrome's security model. Even though the attacker initially gains access through the renderer process, which is typically isolated from system-level operations, this vulnerability allows them to break out of the sandbox boundary and potentially execute arbitrary code with elevated privileges. The exploitation vector relies on the browser's network stack not properly validating or restricting certain operations that should remain confined within the sandbox environment.
The operational impact of this vulnerability is significant as it provides attackers with a pathway to escalate privileges from a compromised renderer process to system-level access. This means that an attacker who has already achieved initial compromise through other means can leverage this flaw to gain broader system control, potentially accessing sensitive user data, system resources, or even performing further attacks against the host machine. The medium severity classification by Chromium reflects the complexity required for exploitation but also acknowledges the substantial privilege escalation potential.
Organizations and users should immediately update to Chrome version 151.0.7922.72 or later to mitigate this vulnerability. Security teams should implement monitoring for suspicious network activity patterns that might indicate exploitation attempts, particularly around sandbox boundary violations. Network segmentation and process isolation measures can provide additional defense-in-depth layers. The remediation approach aligns with standard patch management protocols recommended by NIST SP 800-128 and follows the principle of least privilege as outlined in the CWE guidelines for secure coding practices.