CVE-2026-13873: Google Chrome Information Disclosure Flaw

CVE-2026-13873 Overview

CVE-2026-13873 is an out-of-bounds read vulnerability in the Layout component of Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.47 across Windows, macOS, and Linux. A remote attacker can craft an HTML page that triggers the read past allocated memory boundaries. Successful exploitation allows attackers to obtain potentially sensitive information from the browser process memory. Google classifies the Chromium security severity as Medium. The weakness is tracked under CWE-125 (Out-of-bounds Read). Exploitation requires user interaction, such as visiting an attacker-controlled web page.

Critical Impact
Remote attackers can read sensitive data from Chrome process memory via a crafted HTML page, potentially exposing session tokens, cryptographic material, or cross-origin content.

Affected Products

Google Chrome prior to 150.0.7871.47
Chrome desktop builds for Microsoft Windows, Apple macOS, and Linux
Downstream Chromium-based browsers using the vulnerable Layout code

Discovery Timeline

2026-06-30 - CVE-2026-13873 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-13873

Vulnerability Analysis

The vulnerability resides in Chrome's Layout engine, which is responsible for computing the visual position and size of DOM elements during rendering. An attacker-supplied HTML page triggers a read operation that crosses the boundary of an allocated buffer. The renderer process returns memory contents that were never intended to be exposed to the page.

Because the Layout engine processes untrusted web content on every navigation, the attack surface is broad. The disclosed data can include adjacent heap contents such as pointers, string data, or cross-origin rendering state. Attackers often chain such leaks with memory corruption bugs to bypass Address Space Layout Randomization (ASLR).

Root Cause

The defect is an out-of-bounds read [CWE-125] within layout computation. A specific sequence of DOM or CSS constructs causes the layout code to index beyond the valid range of a container or buffer. Missing or incorrect bounds validation on an index, offset, or length parameter allows the read to proceed.

Attack Vector

Exploitation occurs over the network and requires user interaction. The victim must load a crafted HTML page in a vulnerable Chrome build. No authentication or elevated privileges are needed. The scope remains within the affected renderer process, but the leaked memory can undermine web origin isolation.

No public proof-of-concept or exploit code is currently available. See the Chromium Issue Tracker Entry for restricted technical details.

Detection Methods for CVE-2026-13873

Indicators of Compromise

Chrome renderer processes crashing with SIGSEGV or EXCEPTION_ACCESS_VIOLATION on pages containing unusual layout constructs
Browser telemetry showing repeated navigations to unfamiliar domains hosting complex DOM or CSS payloads
Outbound connections from browser hosts to newly registered domains delivering large inline HTML documents

Detection Strategies

Inventory endpoints and enumerate installed Chrome versions to flag builds below 150.0.7871.47
Inspect web proxy logs for HTML responses containing anomalous nested layouts, oversized CSS grids, or unusual contenteditable and SVG patterns targeting layout code
Correlate renderer crash telemetry with URL history to identify pages triggering layout faults

Monitoring Recommendations

Ingest Chrome crash reports and browser version telemetry into a centralized logging platform
Alert on user navigations to domains classified as newly seen or low-reputation immediately before renderer crashes
Track patch compliance for Chrome and Chromium-based browsers across managed endpoints

How to Mitigate CVE-2026-13873

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints
Force browser restarts after updates to ensure the patched binaries are loaded into memory
Update Chromium-based browsers such as Microsoft Edge, Brave, and Opera once vendors release corresponding fixes

Patch Information

Google addressed the issue in the Chrome Stable channel. See the Google Chrome Stable Update advisory for the official fix announcement. Administrators should deploy the update through enterprise policy or managed software distribution channels.

Workarounds

Enforce Chrome auto-update via enterprise policy to close the exposure window
Restrict browsing to trusted domains through web filtering while patch rollout is in progress
Enable Site Isolation and strict origin policies to limit the scope of any leaked renderer memory

bash

# Verify installed Chrome version on Linux endpoints
google-chrome --version

# Windows: query installed version via registry
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv

# macOS: check bundle version
defaults read /Applications/Google\ Chrome.app/Contents/Info CFBundleShortVersionString