CVE-2026-5282: Google Chrome Out of Bounds Read Flaw

CVE-2026-5282 Overview

CVE-2026-5282 is an out-of-bounds read vulnerability affecting the WebCodecs component in Google Chrome prior to version 146.0.7680.178. This memory safety flaw allows a remote attacker to perform unauthorized memory read operations by enticing a victim to visit a specially crafted HTML page. The vulnerability has been classified with high severity by the Chromium security team.

Critical Impact

Successful exploitation enables attackers to read sensitive data from Chrome's memory and potentially cause application crashes, leading to confidentiality breaches and denial of service conditions for affected users.

Affected Products

• Google Chrome prior to version 146.0.7680.178
• Google Chrome on Microsoft Windows
• Google Chrome on Apple macOS
• Google Chrome on Linux

Discovery Timeline

• 2026-04-01 - CVE-2026-5282 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-5282

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-bounds Read), a memory corruption flaw that occurs when the WebCodecs component in Chrome reads data past the boundaries of an allocated memory buffer. WebCodecs is a browser API that provides low-level access to media encoders and decoders, making it a particularly sensitive component from a security perspective.

The attack requires user interaction—specifically, the victim must be lured to a malicious web page containing crafted HTML content that triggers the out-of-bounds memory access. Once triggered, the vulnerability can expose sensitive information stored in adjacent memory regions or cause the browser process to crash unexpectedly.

Root Cause

The root cause stems from insufficient boundary validation within the WebCodecs implementation when processing certain media-related data structures. When handling specially crafted input, the component fails to properly verify that memory read operations remain within the bounds of allocated buffers, allowing reads beyond intended memory regions.

Attack Vector

The attack vector is network-based, requiring an attacker to host or inject malicious HTML content that exploits the WebCodecs vulnerability. The attack flow typically involves:

1. An attacker crafts a malicious HTML page containing media elements or JavaScript code that interacts with the WebCodecs API
2. The victim is directed to the malicious page via phishing, malvertising, or compromised websites
3. Upon page load, the crafted content triggers the out-of-bounds read condition in Chrome's WebCodecs component
4. The attacker may exfiltrate leaked memory data or cause browser instability

The vulnerability manifests within Chrome's media processing pipeline when handling WebCodecs API calls. For detailed technical analysis, see the Chromium Issue Tracker Entry.

Detection Methods for CVE-2026-5282

Indicators of Compromise

• Unexpected Chrome browser crashes, particularly when visiting unfamiliar websites with media content
• Abnormal memory consumption patterns in Chrome processes during web browsing sessions
• Browser crash reports indicating faults in WebCodecs or media-related components
• Detection of known malicious domains hosting exploit pages in network traffic logs

Detection Strategies

• Monitor for Chrome crash dumps and error reports referencing WebCodecs module failures
• Implement web filtering to block access to known malicious URLs distributing exploits
• Deploy endpoint detection solutions capable of identifying memory corruption exploitation attempts
• Review proxy logs for unusual patterns of access to sites hosting media-heavy or suspicious JavaScript content

Monitoring Recommendations

• Enable Chrome's built-in crash reporting and review aggregated crash data for patterns
• Monitor endpoint protection platforms for alerts related to browser memory anomalies
• Correlate network traffic analysis with known threat intelligence feeds for exploit delivery infrastructure
• Track Chrome version deployment across the organization to identify unpatched instances

How to Mitigate CVE-2026-5282

Immediate Actions Required

• Update Google Chrome to version 146.0.7680.178 or later immediately across all systems
• Enable automatic updates for Chrome to ensure timely deployment of future security patches
• Educate users about the risks of visiting untrusted websites and clicking suspicious links
• Consider temporarily restricting access to high-risk websites until patching is complete

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 146.0.7680.178. The patch includes proper boundary validation for memory operations within the WebCodecs component. Organizations should prioritize deploying this update through their software management systems. For complete details, refer to the Google Chrome Update Announcement.

Workarounds

• Restrict browser access to untrusted or unknown websites through web filtering policies
• Consider disabling WebCodecs functionality via Chrome enterprise policies if the feature is not business-critical
• Deploy network-level protections to block access to known exploit distribution infrastructure
• Use browser isolation technologies to contain potential exploitation attempts

# Verify Chrome version via command line
google-chrome --version
# Expected output: Google Chrome 146.0.7680.178 or higher

# Force Chrome update check on Linux
google-chrome --check-for-update-interval=0

# Enterprise deployment - update Chrome via policy
# Windows: Use Group Policy to enforce automatic updates
# macOS/Linux: Deploy via MDM or package management systems