CVE-2026-10000: Chrome Sandbox Escape via Use-After-Free in Password Handling

Technical summary

CVE-2026-10000 is a use-after-free vulnerability (CWE-416) in the password handling code of Google Chrome on Windows prior to version 148.0.7778.216. The vulnerability allows an attacker with an already-compromised renderer process to craft specific HTML input that triggers memory safety issues, potentially enabling a sandbox escape. The attack chain requires initial renderer compromise, making this a post-exploitation rather than primary-access vector. Chrome's multi-process architecture isolates the renderer in a sandbox; this vulnerability undermines that isolation boundary.

Business impact

Successfully exploiting this vulnerability could allow an attacker to elevate from a compromised renderer process to full system privileges, bypassing Chrome's sandbox containment. This transforms a limited in-browser compromise into unrestricted OS access, enabling malware installation, credential theft at the OS level, lateral network movement, and data exfiltration. Organizations with users browsing untrusted content or facing targeted attacks face elevated risk of system compromise.

Affected systems

Google Chrome on Microsoft Windows is affected through version 148.0.7778.215. Chrome on other operating systems (macOS, Linux, Android, iOS) and other Chromium-based browsers should be verified against their respective vendor advisories. Windows systems running Chrome prior to the patched version 148.0.7778.216 require remediation.

Exploitability

This vulnerability requires two conditions: (1) the renderer process must already be compromised by malicious content, and (2) the user must interact with a crafted HTML page (CWE-416 exploitation typically requires precise timing and memory layout knowledge). The CVSS score of 8.3 reflects the high impact (sandbox escape) balanced against the moderate attack complexity and required user interaction. Exploitation is not trivial but is feasible for sophisticated threat actors. The vulnerability is not currently tracked in CISA's Known Exploited Vulnerabilities catalog.

Remediation

Update Google Chrome to version 148.0.7778.216 or later. Chrome's auto-update mechanism should deploy the patch; verify completion via Chrome menu > About Google Chrome. For organizations managing Chrome deployments, consult Google's enterprise update documentation for your deployment model (MSI, cloud management, etc.). No workarounds are available; patching is the only mitigation.

Patch guidance

Deploy Chrome version 148.0.7778.216 or later across all Windows systems. Use your organization's Chrome management infrastructure (Google Admin Console, Intune, Group Policy, or third-party MDM) to enforce the update. Verify patch status by checking chrome://version in the address bar on managed devices. Prioritize this patch given the sandbox escape impact, though note the multi-stage attack requirement lowers urgency slightly compared to direct remote code execution vulnerabilities.

Detection guidance

Monitor for unexpected renderer process crashes or memory violations on Windows systems, which may indicate exploitation attempts. Web proxy and endpoint detection and response (EDR) solutions should alert on unusual memory access patterns or process elevation from chrome.exe. Monitor Chrome update deployment logs to identify systems still running pre-148.0.7778.216 versions. Threat intelligence feeds tracking sandbox escape exploits should be consulted for behavioral indicators specific to this CWE-416 pattern.

Why prioritize this

This vulnerability merits prompt patching despite not being in active exploit catalogs. The sandbox escape capability elevates any renderer compromise to system compromise, significantly expanding attacker capabilities. The CVSS 8.3 score and Chromium 'High' severity rating reflect the impact. However, the requirement for prior renderer process compromise means this is a secondary rather than primary attack vector. Organizations should patch within standard security update cycles (1–2 weeks) rather than emergency timelines.

Risk score, explained

The 8.3 CVSS v3.1 score combines high impact (confidentiality, integrity, availability all affected at system level), moderate attack complexity (exploitation requires memory corruption skill and timing), and required user interaction (crafted HTML must be viewed). The network vector reflects that the initial renderer compromise typically originates from web content. The score appropriately weights the severity of sandbox escape against the two-stage attack requirement.

Frequently asked questions