CVE-2026-14012: Google Chrome Information Disclosure Flaw

CVE-2026-14012 Overview

CVE-2026-14012 is a side-channel information leakage vulnerability in the Cascading Style Sheets (CSS) implementation of Google Chrome prior to version 150.0.7871.47. A remote attacker can craft a malicious HTML page that exploits observable side effects in CSS processing to obtain potentially sensitive information from Chrome's process memory. The flaw is categorized under CWE-1300 (Improper Protection of Physical Side Channels). Chromium assigned this issue a Medium security severity rating. The vulnerability affects Chrome on Windows, macOS, and Linux desktop platforms.

Critical Impact
A remote attacker can trick a user into loading a crafted HTML page and infer sensitive data from Chrome renderer process memory through CSS-driven side channels.

Affected Products

Google Chrome prior to 150.0.7871.47
Chrome on Microsoft Windows
Chrome on Apple macOS and Linux

Discovery Timeline

2026-06-30 - CVE-2026-14012 published to the National Vulnerability Database
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-14012

Vulnerability Analysis

The vulnerability resides in Chrome's CSS engine, where certain style computations produce observable timing or rendering differences that depend on cross-origin or otherwise inaccessible data. An attacker hosts a crafted HTML page containing CSS constructs designed to trigger these differences. By measuring the resulting side effects, the attacker infers bytes of memory that the same-origin policy and process isolation are intended to protect. Exploitation requires user interaction, specifically the victim navigating to attacker-controlled content. The attack complexity is high because reliable inference depends on precise timing and controlled page conditions.

Root Cause

The root cause is a physical or micro-architectural side channel exposed through the CSS pipeline, tracked as CWE-1300. Style resolution paths do not sufficiently equalize execution behavior across secret-dependent inputs. Consequently, observable properties of style computation leak information about adjacent memory or protected content. Details are restricted in the Chromium Issue Tracker Entry pending broad user patch adoption.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker delivers the payload through any channel that renders untrusted HTML in Chrome, including a malicious website, a compromised third-party frame, or a phishing link. Once the page renders, embedded CSS and script measure timing or layout signals derived from restricted memory. The confidentiality impact is high, while integrity and availability are not affected. No authentication or elevated privilege is required on the target.

No verified public proof-of-concept code is available for this vulnerability. Technical specifics remain restricted in the upstream Chromium tracker. See the Chromium Issue Tracker Entry for future disclosure.

Detection Methods for CVE-2026-14012

Indicators of Compromise

Chrome desktop clients reporting a version older than 150.0.7871.47 in enterprise inventory telemetry.
Outbound browser navigations to newly registered or low-reputation domains hosting HTML pages with heavy, repetitive CSS animation or @container query workloads.
Renderer processes exhibiting sustained CPU usage tied to a single tab performing repeated style recalculations.

Detection Strategies

Query endpoint inventory data for Chrome versions below 150.0.7871.47 across Windows, macOS, and Linux fleets.
Correlate web proxy logs with threat intelligence feeds to identify user visits to domains associated with browser exploitation activity.
Monitor Chrome Enterprise reporting for crashes or anomalies in the renderer process that coincide with visits to unfamiliar domains.

Monitoring Recommendations

Enforce Chrome auto-update policies and alert when managed hosts remain on outdated builds beyond the patch grace period.
Ingest browser and proxy telemetry into a central analytics platform and pivot on user-agent version fields.
Track user reports of unexpected page behavior, such as unresponsive tabs, that may indicate exploitation attempts requiring user interaction.

How to Mitigate CVE-2026-14012

Immediate Actions Required

Update all Chrome installations to version 150.0.7871.47 or later across Windows, macOS, and Linux endpoints.
Push the update through Chrome Enterprise policies, MDM, or software distribution tooling to reduce user dependency on manual updates.
Communicate to users that they should relaunch Chrome after the update to complete installation.

Patch Information

Google released the fix in the Chrome Stable Channel update covered by the Google Chrome Stable Update announcement. Administrators should confirm that endpoints report the fixed build via chrome://version or centralized inventory. Chromium-based browsers that consume upstream fixes should apply their vendor's corresponding release.

Workarounds

Restrict browsing to trusted sites through URL filtering or web proxy allowlists until patches are deployed.
Enable Chrome Site Isolation and Strict Site Isolation policies to reduce cross-origin memory exposure in renderer processes.
Deploy browser security policies that block execution of unsolicited third-party content, such as ad-blocking or script-blocking extensions managed by IT.

bash

# Verify installed Chrome version on Linux/macOS
google-chrome --version
# Windows PowerShell: inventory Chrome version across managed hosts
Get-ItemProperty 'HKLM:\SOFTWARE\Google\Update\Clients\*' |
  Where-Object { $_.name -like '*Chrome*' } |
  Select-Object name, pv