CVE-2026-14087: Chrome WebNN Heap Buffer Overflow (Windows) – Patch Guidance

Technical summary

CVE-2026-14087 is a heap buffer overflow (CWE-787) stemming from improper input validation (CWE-20) in Chrome's WebNN implementation prior to version 150.0.7871.47 on Windows. The vulnerability requires an attacker to first compromise the renderer process—a sandboxed execution environment—before crafting a specially formed HTML payload that triggers out-of-bounds memory writes. Successful exploitation could enable arbitrary code execution within the renderer context, potentially allowing further system compromise depending on sandbox escape conditions and platform defenses.

Business impact

Organizations running Chrome on Windows should assess exposure among users handling untrusted web content, particularly in settings where renderer process compromise is plausible (malicious ads, compromised websites, social engineering). While the vulnerability requires prior renderer compromise, successful exploitation could lead to data exfiltration, malware installation, or lateral movement. The high CVSS score reflects worst-case impact; actual risk depends on organizational threat model and user populations.

Affected systems

Google Chrome versions prior to 150.0.7871.47 running on Microsoft Windows are affected. The vulnerability does not impact other operating systems (Linux, macOS) or other Chromium-based browsers unless they bundle the vulnerable WebNN implementation without patching. Organizations should inventory Chrome deployments on Windows infrastructure, including managed endpoints and BYOD devices.

Exploitability

Exploitation requires two preconditions: (1) a remote attacker must first achieve renderer process compromise through a separate vulnerability or attack vector, and (2) the attacker must then craft a malicious HTML page to trigger the heap overflow. This two-stage requirement significantly reduces real-world exploitability compared to standalone remote code execution. No public exploit code or KEV listing indicates active exploitation in the wild as of the vulnerability publication date.

Remediation

Update Google Chrome to version 150.0.7871.47 or later on all Windows systems. Chrome's built-in automatic update mechanism will deploy patches; verify deployment across your organization, particularly for managed devices. No workarounds are available; patching is the only mitigation. Users should ensure auto-updates are enabled and systems are rebooted to complete updates if required.

Patch guidance

Chrome users on Windows should receive automatic updates; verify update completion by navigating to chrome://settings/help, which displays the current version and prompts updates if needed. Enterprise administrators managing Chrome deployments should verify patch rollout through Chrome Enterprise policies and device reporting tools. For offline environments, download Chrome 150.0.7871.47 or later from the official Google Chrome website. Confirm patch application across your fleet before closing any related tickets.

Detection guidance

Monitor Chrome update status across Windows endpoints to confirm version 150.0.7871.47 or later deployment. Web application firewalls and intrusion detection systems are unlikely to detect pre-exploit renderer compromise, so focus on detecting the prior attack vector (e.g., credential theft, watering hole attacks, malvertising) that would enable renderer process compromise. Log review for unusual child process spawning or memory corruption signals may indicate exploitation attempts post-breach, but prevention via patching is paramount.

Why prioritize this

Despite Chromium's low internal severity rating, the CVSS 3.1 score of 8.8 (HIGH) correctly reflects the confluence of network accessibility, user interaction, and high impact. Prioritize patching in the near term (within 1–2 weeks) because Chrome's ubiquity and automatic update infrastructure make widespread deployment straightforward. The two-stage attack requirement lowers practical urgency compared to zero-click remote code execution, but the ease of patching and high impact justify prompt action.

Risk score, explained

The CVSS 3.1 vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) yields 8.8 because: Attack Vector is Network (user must open a malicious page), Attack Complexity is Low (no special conditions beyond renderer compromise), Privileges Required is None (attacker does not need OS-level access), User Interaction is Required (user must interact with the malicious page), Scope is Unchanged, and impact is High across Confidentiality, Integrity, and Availability. The score appropriately weights the vulnerability's danger despite its multi-stage exploitation requirement.

Frequently asked questions