CVE-2026-13025: Chrome DevTools Race Condition Enables Sandbox Escape

Technical summary

CVE-2026-13025 is a race condition (CWE-20: Improper Input Validation) in the DevTools subsystem of Google Chrome. The flaw exists in versions prior to 149.0.7827.197. Successful exploitation requires an initial renderer process compromise—meaning the attacker must first break into Chrome's sandboxed renderer via another vulnerability or attack vector. From that compromised state, a crafted HTML page can trigger a timing-dependent code path in DevTools that allows escaping the renderer sandbox and executing arbitrary code with the privileges of the host operating system. The Chromium security team assigned this a High severity rating.

Business impact

While the vulnerability itself requires a prior renderer process compromise, the sandbox escape capability significantly amplifies the impact of any successful Chrome exploitation chain. Attackers who compromise a user's Chrome browser can immediately elevate to full system access, enabling credential theft, malware installation, lateral movement to other systems, and data exfiltration. For organizations with users on unpatched Chrome installations, this creates a direct pathway from web-based attack to complete endpoint compromise.

Affected systems

The vulnerability affects Google Chrome versions prior to 149.0.7827.197 running on Windows, macOS, and Linux systems. All three major operating systems are impacted equally. The vulnerability does not directly affect the kernel or OS vendors, but rather the Chrome browser application on these platforms.

Exploitability

Exploitation requires two conditions: (1) the renderer process must already be compromised through a separate vulnerability or attack, and (2) the attacker must deliver a crafted HTML page to the victim. While the attack surface is technically limited to users whose renderer has been compromised, the race condition itself is deterministic enough that once the initial compromise is achieved, the sandbox escape is reliably exploitable. The CVSS score of 8.3 (High) reflects the severe post-compromise impact, though the practical attack chain requires chaining with another vulnerability.

Remediation

Immediately update Google Chrome to version 149.0.7827.197 or later. Chrome's auto-update mechanism will deploy this version; users should restart their browser to ensure the patch is applied. Organizations should verify deployment through browser inventory tools and block access to websites that serve exploit content targeting this flaw until patching is complete.

Patch guidance

Update to Google Chrome 149.0.7827.197 or later. For enterprise environments, use your centralized Chrome management tools (Google Admin Console, Group Policy, or equivalent) to enforce minimum version requirements. Verify the installed version via chrome://version in the address bar. For macOS and Linux, ensure auto-updates are enabled or manually install the latest stable release. Test critical web applications after updating to confirm compatibility.

Detection guidance

Monitor for unusual process behavior on systems running unpatched Chrome, including unexpected child processes spawning from the Chrome browser process with elevated privileges. Inspect browser crash logs and renderer process terminations for evidence of exploitation attempts. Network-level detection is limited; however, intrusion detection systems should flag suspicious HTML content designed to trigger race conditions (often involving repeated DOM modifications or timing-sensitive DevTools API calls). Correlate any Chrome sandbox escape attempts with prior indicators of renderer compromise.

Why prioritize this

This vulnerability warrants high priority patching because it provides a direct sandbox escape for any attacker who achieves the initial renderer compromise. While the vulnerability itself requires a prior exploit, sandbox escapes represent a critical escalation point that multiplies the impact of web-based attacks. The CVSS score of 8.3 reflects this severity, and the three-day window between discovery (June 24) and public awareness (June 26) suggests active security research. Organizations should treat this as a blocking issue for unpatched Chrome users.

Risk score, explained

The CVSS 3.1 score of 8.3 (High) is driven by: high impact across confidentiality, integrity, and availability (C:H, I:H, A:H) due to full system code execution; network attack vector (AV:N) allowing delivery via crafted webpages; and scope change (S:C) indicating the vulnerability impacts the host OS beyond the vulnerable component. The high attack complexity (AC:H) and user interaction requirement (UI:R) reduce it from Critical, reflecting the need for renderer compromise and victim interaction with malicious content.

Frequently asked questions