CVE-2026-3540: Google Chrome Buffer Overflow Vulnerability

CVE-2026-3540 Overview

CVE-2026-3540 is an inappropriate implementation vulnerability in the WebAudio component of Google Chrome prior to version 145.0.7632.159. This flaw allows a remote attacker to perform out-of-bounds memory access via a specially crafted HTML page. The vulnerability is classified as an Out-of-Bounds Read (CWE-125), which can lead to information disclosure, memory corruption, or potentially arbitrary code execution when users visit malicious web pages.

Critical Impact

Remote attackers can exploit this vulnerability to access memory outside intended bounds, potentially leading to sensitive information disclosure or code execution when victims browse attacker-controlled websites.

Affected Products

• Google Chrome prior to version 145.0.7632.159
• Google Chrome on Microsoft Windows
• Google Chrome on Apple macOS
• Google Chrome on Linux

Discovery Timeline

• 2026-03-04 - CVE-2026-3540 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-3540

Vulnerability Analysis

The vulnerability resides in Google Chrome's WebAudio API implementation, which is used for processing and synthesizing audio in web applications. The inappropriate implementation allows attackers to trigger out-of-bounds memory read operations when the browser processes audio data from a maliciously crafted HTML page.

WebAudio is a powerful JavaScript API that enables complex audio operations, including creating audio sources, adding effects, and visualizing audio data. Due to the vulnerability's nature as a CWE-125 (Out-of-Bounds Read), the flaw likely occurs when the WebAudio component fails to properly validate array indices or buffer boundaries during audio processing operations.

The attack requires user interaction—specifically, a victim must navigate to an attacker-controlled web page containing the malicious HTML and JavaScript code. Once triggered, the out-of-bounds read could expose sensitive memory contents or corrupt browser memory state, potentially enabling further exploitation.

Root Cause

The root cause is an inappropriate implementation in Chrome's WebAudio component that fails to properly enforce memory boundaries when processing audio data. This allows read operations to access memory locations outside the intended buffer, constituting a classic out-of-bounds read vulnerability.

Attack Vector

The attack is network-based and requires the victim to visit a malicious web page. An attacker would craft an HTML page containing JavaScript that manipulates the WebAudio API in a way that triggers the out-of-bounds memory access. Attack scenarios include:

1. Hosting malicious content on attacker-controlled websites
2. Compromising legitimate websites to serve the exploit payload
3. Distributing links through phishing campaigns or social engineering
4. Embedding malicious content in advertisements (malvertising)

The vulnerability does not require authentication or special privileges, but does require user interaction to visit the malicious page. Once the page is loaded, the exploit can execute automatically through JavaScript.

Detection Methods for CVE-2026-3540

Indicators of Compromise

• Unusual browser crashes or instability when visiting certain websites
• Unexpected memory consumption spikes in Chrome's renderer processes
• Suspicious WebAudio API calls in web traffic or JavaScript execution logs
• Browser memory dumps indicating out-of-bounds access patterns

Detection Strategies

• Monitor for Chrome versions prior to 145.0.7632.159 across the enterprise environment
• Deploy endpoint detection rules for abnormal Chrome renderer process behavior
• Implement web proxy logging to identify suspicious audio-heavy web content
• Use browser telemetry to detect repeated WebAudio-related crashes

Monitoring Recommendations

• Enable Chrome crash reporting and analyze crash dumps for WebAudio-related failures
• Monitor network traffic for connections to known malicious domains distributing Chrome exploits
• Configure SIEM alerts for multiple Chrome crash events from the same endpoint
• Track browser version compliance across the organization to identify unpatched installations

How to Mitigate CVE-2026-3540

Immediate Actions Required

• Update Google Chrome to version 145.0.7632.159 or later immediately
• Enable automatic updates for Chrome to ensure timely security patches
• Consider temporarily disabling JavaScript on untrusted websites until patching is complete
• Implement browser isolation technologies for high-risk browsing activities

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 145.0.7632.159. The fix is available through Chrome's automatic update mechanism. Organizations should verify that all Chrome installations have been updated by checking the browser version through the Help > About Google Chrome menu.

For detailed patch information, refer to the Google Chrome Stable Channel Update Announcement. Additional technical details can be found in the Chromium Issue Tracker.

Workarounds

• Enable Site Isolation in Chrome to reduce cross-site exploit impact
• Use browser-based content security policies to restrict WebAudio API access where possible
• Deploy network-level controls to block known malicious domains
• Consider using alternative browsers temporarily if immediate patching is not feasible

# Force Chrome update check (command line)
# Windows
"C:\Program Files\Google\Chrome\Application\chrome.exe" --check-for-update-interval=1

# macOS/Linux - Verify Chrome version
google-chrome --version
# Ensure version is 145.0.7632.159 or higher