CVE-2026-14087: Google Chrome Buffer Overflow Vulnerability

CVE-2026-14087 Overview

CVE-2026-14087 is a heap buffer overflow vulnerability in the Web Neural Network (WebNN) component of Google Chrome on Windows. The flaw affects Chrome versions prior to 150.0.7871.47. A remote attacker who has already compromised the renderer process can exploit heap corruption by delivering a crafted HTML page to the victim. Successful exploitation requires user interaction, such as visiting an attacker-controlled page. The vulnerability is tracked under [CWE-787] (Out-of-Bounds Write) and [CWE-20] (Improper Input Validation). Google classified the Chromium security severity as Low, though NVD scoring places it in the high range due to the potential for confidentiality, integrity, and availability impact.

Critical Impact
Attackers who compromise the Chrome renderer process can trigger heap corruption via WebNN, enabling sandbox escape chains and potential arbitrary code execution on Windows hosts.

Affected Products

Google Chrome on Windows prior to 150.0.7871.47
Microsoft Windows (host operating system)
WebNN component within Chromium-based builds matching the affected Chrome range

Discovery Timeline

2026-06-30 - CVE-2026-14087 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-14087

Vulnerability Analysis

The vulnerability resides in Chrome's WebNN implementation, which exposes hardware-accelerated machine learning primitives to web content. WebNN processes tensor operations and model graphs supplied by JavaScript, allocating heap buffers to hold intermediate results. Improper input validation on operand dimensions or buffer sizes allows a write to exceed allocated heap boundaries. An attacker who first gains control of the renderer process through a separate bug can then trigger the WebNN code path to corrupt adjacent heap objects. This corruption creates conditions suitable for chaining into a sandbox escape or achieving full renderer-to-browser process compromise. The bug requires user interaction, meaning the victim must load the crafted HTML page in the vulnerable browser.

Root Cause

The root cause combines improper input validation [CWE-20] with an out-of-bounds write [CWE-787] in WebNN. Insufficient bounds checking on parameters derived from JavaScript-supplied graph definitions permits the heap write to extend past the intended allocation. Details are tracked in the Chromium Issue Tracker Entry.

Attack Vector

Exploitation is network-based and requires that the attacker already control the renderer process. The attacker hosts a crafted HTML page that constructs a malicious WebNN graph. When the victim visits the page in a vulnerable Chrome build, the WebNN operation triggers the heap overflow. Because the renderer is already compromised, the attacker can shape the heap to weaponize the corruption reliably.

No public proof-of-concept code is available. Refer to the Google Chrome Update Announcement and the linked Chromium issue for technical context.

Detection Methods for CVE-2026-14087

Indicators of Compromise

Chrome renderer processes on Windows crashing with heap corruption signatures shortly after loading untrusted pages that invoke WebNN APIs.
Unexpected child process creation from chrome.exe renderer instances following visits to attacker-controlled domains.
Windows Error Reporting entries referencing WebNN or ML compute modules in Chrome versions below 150.0.7871.47.

Detection Strategies

Inventory endpoints running Chrome versions prior to 150.0.7871.47 and flag them for prioritized patching.
Correlate browser crash telemetry with subsequent process, file, or network anomalies to identify possible exploit chains.
Hunt for HTML content invoking WebNN constructs from newly observed or low-reputation domains in web proxy logs.

Monitoring Recommendations

Track Chrome process integrity levels and parent-child relationships to detect renderer escape attempts on Windows.
Monitor egress from workstations to newly registered domains after Chrome browsing sessions involving script-heavy pages.
Enable and centralize Chrome enterprise reporting to capture version drift and crash telemetry across the fleet.

How to Mitigate CVE-2026-14087

Immediate Actions Required

Update Google Chrome on all Windows endpoints to version 150.0.7871.47 or later.
Restart Chrome after applying the update to ensure the patched binaries are loaded.
Verify enterprise update policies are enforcing automatic Chrome upgrades and are not pinned to a vulnerable channel.

Patch Information

Google addressed the issue in the Stable channel release documented in the Google Chrome Update Announcement. Fixed builds are Chrome 150.0.7871.47 and later on Windows. Administrators managing Chrome through Group Policy or Chrome Browser Cloud Management should confirm the TargetVersionPrefix policy permits the fixed version.

Workarounds

Disable WebNN via Chrome enterprise policy or flag configuration where feasible until patching completes.
Restrict browsing to trusted sites through URL allow-lists for high-risk user populations.
Apply site isolation and strict renderer sandbox policies to reduce impact of renderer compromise.

bash

# Verify installed Chrome version on Windows endpoints
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version

# Force update via Google Update on managed hosts
"%ProgramFiles(x86)%\Google\Update\GoogleUpdate.exe" /ua /installsource scheduler