CVE-2026-5883: Google Chrome Use After Free Vulnerability

CVE-2026-5883 Overview

CVE-2026-5883 is a use-after-free vulnerability [CWE-416] in the Media component of Google Chrome. The flaw exists in versions prior to 147.0.7727.55 and allows a remote attacker to execute arbitrary code inside the Chrome sandbox by serving a crafted HTML page. Successful exploitation requires the victim to load attacker-controlled content in the browser.

Google assigned this issue a Chromium security severity rating of Medium, while the National Vulnerability Database scores it 8.8 (High). The vulnerability affects Chrome on Windows, macOS, and Linux. Google addressed the issue in the Stable channel update for desktop.

Critical Impact

Remote attackers can execute arbitrary code within the Chrome renderer sandbox by luring users to a malicious web page, enabling further chained exploitation against the browser process.

Affected Products

• Google Chrome prior to 147.0.7727.55
• Chrome desktop builds on Microsoft Windows
• Chrome desktop builds on Apple macOS
• Chrome desktop builds on Linux

Discovery Timeline

• 2026-04-08 - CVE-2026-5883 published to the National Vulnerability Database
• 2026-04-16 - Last updated in NVD database

Technical Details for CVE-2026-5883

Vulnerability Analysis

The vulnerability resides in Chrome's Media component, which handles audio and video playback, decoding, and stream management. A use-after-free condition occurs when the component references heap memory that has already been released. An attacker who controls the timing and content of media-related operations can place attacker-influenced data into the freed allocation.

When Chrome later dereferences the dangling pointer, it operates on attacker-controlled data. This primitive can be shaped into arbitrary read, arbitrary write, or control-flow hijack within the renderer process. Exploitation occurs entirely within the Chrome sandbox, but renderer-level code execution is a common first stage in browser exploit chains that pair with a sandbox escape to achieve full system compromise.

Root Cause

The root cause is improper object lifetime management in the Media subsystem, classified as [CWE-416] Use After Free. Code paths in the component retain or reuse a pointer to a media object after that object has been deallocated, typically due to asynchronous callbacks, reference counting errors, or unexpected state transitions during media handling.

Attack Vector

The attack vector is network-based and requires user interaction. A victim must visit a web page containing crafted HTML and media content delivered by the attacker. No authentication or prior privilege on the target system is required. The crafted page triggers the vulnerable media path, frees the underlying object, and then forces a subsequent use of the freed memory.

The vulnerability is exploitable through standard browsing scenarios including phishing links, malvertising, compromised websites, and embedded iframes. Refer to the Chromium Issue Tracker entry for additional technical context.

Detection Methods for CVE-2026-5883

Indicators of Compromise

• Chrome renderer process crashes referencing media playback components, particularly segmentation faults during audio or video decoding
• Outbound connections from chrome.exe child processes to unfamiliar domains immediately after media-heavy page loads
• Unexpected child processes spawned by the Chrome renderer following user navigation to untrusted sites
• Browser telemetry showing Chrome versions earlier than 147.0.7727.55 still in production use

Detection Strategies

• Inventory installed Chrome versions across the fleet and flag any host running a build earlier than 147.0.7727.55
• Monitor endpoint telemetry for anomalous behavior originating from Chrome renderer processes, including memory access violations and process injection attempts
• Inspect web proxy and DNS logs for known malicious domains hosting browser exploit kits that target recent Chrome use-after-free issues

Monitoring Recommendations

• Enable browser crash reporting and forward renderer crash dumps to a central analysis pipeline
• Correlate browser version data from asset management with vulnerability scan results on a recurring schedule
• Alert on Chrome processes performing unexpected file writes, registry modifications, or persistence operations

How to Mitigate CVE-2026-5883

Immediate Actions Required

• Update Google Chrome to version 147.0.7727.55 or later on all Windows, macOS, and Linux endpoints
• Force-restart Chrome after deploying the update to ensure the patched binary is loaded into memory
• Verify deployment by checking chrome://version or querying installed software inventory across managed endpoints
• Restrict access to high-risk web categories through web filtering until patching is fully verified

Patch Information

Google released the fix in the Chrome Stable channel for desktop. Administrators should consult the Google Chrome Stable channel update advisory for full release notes and deployment guidance. Enterprise deployments managed through Chrome Browser Cloud Management or Group Policy should confirm that auto-update channels are enabled and not blocked by network egress rules.

Workarounds

• Disable or restrict media autoplay through enterprise policy until patches are applied
• Deploy site isolation and strict process-per-site policies to limit cross-origin exposure
• Use browser extensions or DNS filtering to block known malvertising and exploit kit infrastructure
• Apply principle of least privilege so that renderer code execution cannot easily pivot to administrative actions

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

# Windows: query installed version via registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version

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