CVE-2025-13638 Overview
CVE-2025-13638 is a use-after-free vulnerability in the Media Stream component of Google Chrome versions prior to 143.0.7499.41. A remote attacker can exploit heap corruption by serving a crafted HTML page to a target user. The flaw is tracked under [CWE-416: Use After Free] and affects Chrome on Windows, macOS, and Linux. Successful exploitation requires user interaction, such as visiting a malicious page, and can lead to arbitrary code execution within the renderer process. While Chromium classifies the internal security severity as Low, NVD scoring reflects the potential for high impact to confidentiality, integrity, and availability when chained with a sandbox escape.
Critical Impact
Remote attackers can trigger heap corruption in Chrome's Media Stream component through a crafted web page, potentially leading to arbitrary code execution in the renderer process.
Affected Products
- Google Chrome versions prior to 143.0.7499.41
- Chrome on Microsoft Windows, Apple macOS, and Linux
- Chromium-based browsers incorporating the vulnerable Media Stream code
Discovery Timeline
- 2025-12-02 - CVE-2025-13638 published to NVD
- 2025-12-04 - Last updated in NVD database
Technical Details for CVE-2025-13638
Vulnerability Analysis
The vulnerability resides in the Media Stream implementation, which handles getUserMedia requests, audio and video track lifecycle management, and WebRTC media pipelines. A use-after-free condition occurs when code references a heap object after that object has been freed. An attacker who controls timing of media stream events can manipulate the renderer into dereferencing a stale pointer. Heap corruption that follows can be shaped to overwrite virtual function pointers or adjacent metadata, redirecting execution flow. Because the bug lives in the renderer, it is sandboxed by default, so attackers typically pair it with a separate sandbox escape to achieve full system compromise.
Root Cause
The root cause is improper object lifetime management within Media Stream code paths. References to media track or stream objects persist after destruction, leaving dangling pointers that subsequent operations dereference. This pattern matches the broader [CWE-416] class of bugs that frequently affect complex C++ subsystems handling asynchronous events.
Attack Vector
Exploitation requires the victim to load attacker-controlled HTML in Chrome. The page uses JavaScript and WebRTC APIs to construct, manipulate, and release media stream objects in a sequence that triggers the dangling reference. No authentication or prior access is required, but the user must visit or be redirected to the malicious page.
No public proof-of-concept code is available. See the Chromium Issue Tracker #448046109 for upstream technical details once access restrictions are lifted.
Detection Methods for CVE-2025-13638
Indicators of Compromise
- Unexpected Chrome renderer process crashes containing references to Media Stream, WebRTC, or blink::MediaStream symbols in crash logs
- Outbound connections from Chrome renderer processes to unfamiliar domains immediately after media-related page interactions
- Chrome child processes spawning shell interpreters or writing executables to user-writable directories
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag any build below 143.0.7499.41
- Monitor endpoint telemetry for anomalous child-process creation from chrome.exe, Google Chrome Helper, or Linux Chrome renderer binaries
- Inspect web proxy logs for users visiting newly registered domains that request getUserMedia permissions
Monitoring Recommendations
- Enable browser crash reporting and forward dumps to a central analysis system to identify clusters of Media Stream faults
- Alert on Chrome processes performing unusual file writes, registry modifications, or persistence operations
- Correlate browser version data from asset management with vulnerability scan output to track patch coverage
How to Mitigate CVE-2025-13638
Immediate Actions Required
- Update Google Chrome to version 143.0.7499.41 or later on all Windows, macOS, and Linux endpoints
- Restart Chrome after patch installation to ensure the vulnerable renderer code is unloaded
- Push the update through enterprise management tooling rather than relying on user-initiated updates
Patch Information
Google released the fix in the Chrome Stable channel update documented at the Google Chrome Stable Update. Administrators should validate that managed Chrome installations report a version of 143.0.7499.41 or higher. Chromium-based browsers such as Microsoft Edge, Brave, and Opera should be updated once their vendors integrate the upstream fix.
Workarounds
- Restrict getUserMedia and WebRTC permissions through Chrome enterprise policies such as AudioCaptureAllowed and VideoCaptureAllowed set to false where business needs allow
- Block access to untrusted sites using web filtering until patching is complete
- Disable Chrome on high-value systems until the update is verified, using an alternative patched browser for required tasks
# Verify Chrome version on Linux
google-chrome --version
# Verify Chrome version on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version
# Windows: check version via registry
reg query "HKLM\SOFTWARE\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
