CVE-2026-17908 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Printing in Google Chrome on Windows 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: Low)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical sandbox escape risk in Google Chrome's printing functionality on Windows systems. The flaw stems from inadequate input validation within the printing component that handles untrusted data from web pages, specifically when processing print requests originating from compromised renderer processes. Attackers who have already achieved renderer process compromise can exploit this weakness to break out of Chrome's security sandbox and gain elevated privileges within the operating system. The vulnerability affects Chrome versions prior to 151.0.7922.72, where the printing subsystem failed to properly validate or sanitize input parameters that could be manipulated through malicious HTML content.
The technical implementation of this vulnerability involves the printing subsystem's handling of untrusted data without adequate sanitization or validation checks. When Chrome processes print requests from web pages, it must validate various input parameters including document formatting, page dimensions, and printer configuration settings. The insufficient validation allows attackers to craft specially crafted HTML pages that manipulate these parameters in ways that bypass security boundaries. This type of flaw typically relates to CWE-20, which covers "Improper Input Validation," and specifically manifests as a sandbox escape vector through improper handling of untrusted data within system components.
The operational impact of this vulnerability is significant for organizations relying on Chrome for web browsing, as it provides attackers with a pathway to elevate privileges from renderer process level to full system access. Once an attacker has compromised the renderer process through other means such as drive-by downloads or social engineering attacks, they can leverage this printing vulnerability to escape the sandbox and potentially execute arbitrary code with system-level privileges. This represents a particularly dangerous escalation vector because it allows attackers to bypass Chrome's security model that normally isolates rendering processes from system resources. The low severity classification by Chromium reflects the limited attack surface, but the potential for privilege escalation makes this a serious concern for enterprise environments.
Mitigation strategies should focus on immediate patching of Chrome installations to version 151.0.7922.72 or later, which contains the necessary input validation fixes for the printing subsystem. Organizations should also implement network-level protections such as content filtering and web application firewalls to reduce the likelihood of attackers delivering malicious HTML pages that could exploit this vulnerability. Browser hardening measures including disabling unnecessary printing features and restricting access to local resources can provide additional defense in depth. Security monitoring should include detection of unusual print requests or sandbox escape attempts, with particular attention to processes that attempt to access system resources after print operations. This vulnerability aligns with ATT&CK technique T1059.007 for Windows Scripting and T1068 for Exploitation for Privilege Escalation, demonstrating how input validation flaws can enable attackers to perform privilege escalation through sandbox escape mechanisms.