CVE-2026-13971: Google Chrome Information Disclosure Flaw

CVE-2026-13971 Overview

CVE-2026-13971 is an uninitialized memory use vulnerability in the Skia graphics library used by Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.47 across Windows, macOS, and Linux. A remote attacker who has already compromised the renderer process can leverage a crafted HTML page to read potentially sensitive information from process memory. The weakness is categorized under [CWE-457: Use of Uninitialized Variable]. Google classifies the Chromium security severity as Medium.

Critical Impact
Attackers with a compromised renderer can extract residual memory contents from the Skia graphics pipeline, potentially exposing cross-origin data or memory addresses useful for further exploitation.

Affected Products

Google Chrome versions prior to 150.0.7871.47
Chrome on Microsoft Windows, Apple macOS, and Linux desktop builds
Chromium-based downstream browsers that embed vulnerable Skia builds

Discovery Timeline

2026-06-30 - CVE-2026-13971 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-13971

Vulnerability Analysis

The vulnerability resides in Skia, the 2D graphics engine that Chrome uses to render HTML, CSS, and Canvas content. Skia allocates buffers and structures during rasterization and drawing operations. In this defect, one or more variables or memory regions are consumed before being fully initialized. Because renderer memory is reused across allocations, uninitialized reads can return leftover bytes from earlier drawing operations, decoded images, or JavaScript heap regions.

The attacker must first compromise the renderer process through a separate bug. Once inside the sandbox, the crafted HTML page triggers the Skia path that returns memory contents to attacker-controlled JavaScript. This behavior aligns with the CVSS profile requiring user interaction and a high attack complexity.

Root Cause

The root cause is a failure to zero-initialize or explicitly populate a buffer before it is read by downstream Skia code. Under [CWE-457], the compiler and language runtime do not guarantee variable initialization, and the affected code path relies on assumptions about prior writes that do not always hold. When Skia serializes the rendered output back to the caller, the uninitialized bytes leak into a reachable channel.

Attack Vector

Exploitation requires a two-stage chain. The attacker first achieves code execution or type confusion inside the renderer process. The attacker then loads or injects a crafted HTML document that exercises the vulnerable Skia rendering path. The resulting pixel or buffer data contains residual memory bytes that the attacker reads via canvas readback, WebGL, or comparable APIs.

The vulnerability does not grant code execution on its own. Its practical value lies in disclosing addresses, tokens, or cross-origin content that support sandbox escape or address space layout randomization (ASLR) bypass.

No public proof-of-concept exploit is available. Technical details are tracked in the Chromium Issue Tracker Entry.

Detection Methods for CVE-2026-13971

Indicators of Compromise

Chrome processes running versions earlier than 150.0.7871.47 after the patch release window
Renderer processes exhibiting crashes or anomalous memory reads coincident with Skia rendering activity
Outbound traffic containing what appears to be raw memory fragments transmitted from browser sessions

Detection Strategies

Inventory installed browser versions and flag endpoints running Chrome builds below 150.0.7871.47
Monitor for exploit chains that pair renderer-process compromises with subsequent canvas or WebGL data exfiltration
Correlate browser crash telemetry with visits to untrusted origins that render complex graphics content

Monitoring Recommendations

Ingest browser version telemetry into the SIEM and alert on outdated Chrome installations
Track process creation events for chrome.exe renderer children and review unusual child process behavior
Review DNS and HTTP logs for connections to newly registered domains that serve heavy Canvas or WebGL payloads

How to Mitigate CVE-2026-13971

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints
Restart browser sessions after the update to ensure the patched Skia binary is loaded into memory
Audit Chromium-based browsers such as Edge, Brave, and Opera and apply their corresponding upstream fixes

Patch Information

Google addressed the issue in the Chrome Stable Channel update documented in the Google Chrome Desktop Update. Administrators should deploy 150.0.7871.47 or newer through enterprise update channels such as Chrome Browser Cloud Management, Microsoft Intune, or Jamf.

Workarounds

Enforce Chrome auto-update policies through group policy or MDM to eliminate version drift
Restrict browsing to trusted origins using enterprise policy while patch rollout completes
Disable unnecessary GPU acceleration features on high-risk endpoints until updates are applied

bash

# Verify Chrome version on Linux/macOS
google-chrome --version

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

# Enterprise policy example (Windows registry) to force auto-update
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault /t REG_DWORD /d 1 /f