CVE-2026-13820: Google Chrome Information Disclosure Flaw

CVE-2026-13820 Overview

CVE-2026-13820 is an out-of-bounds read vulnerability [CWE-125] in the Skia graphics library used by Google Chrome on macOS. The flaw affects Chrome versions prior to 150.0.7871.47. A remote attacker who has already compromised the renderer process can leak cross-origin data by serving a crafted HTML page to the victim. Google classifies the Chromium security severity as High, while the CVSS v3.1 base score is 6.5. The issue was disclosed through the Chrome Stable channel update and tracked in the Chromium issue tracker.

Critical Impact
Attackers with renderer process access can read cross-origin memory contents, breaking the browser's same-origin isolation and exposing sensitive user data from other web origins.

Affected Products

Google Chrome for macOS versions prior to 150.0.7871.47
Apple macOS (as the affected platform)
Skia graphics library component within Chromium

Discovery Timeline

2026-06-30 - CVE-2026-13820 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-13820

Vulnerability Analysis

The vulnerability resides in Skia, the 2D graphics rendering library that Chrome uses to draw canvas, images, and other visual elements. An out-of-bounds read [CWE-125] occurs when Skia processes attacker-controlled graphics data and accesses memory beyond the intended buffer boundary. On macOS builds prior to 150.0.7871.47, this behavior can be triggered from within a compromised renderer process.

Exploitation requires two conditions. First, the attacker must already control the renderer process, typically through a chained bug such as a V8 or Blink vulnerability. Second, the victim must load a crafted HTML page that triggers the specific Skia code path. The read primitive allows attackers to disclose memory contents, including cross-origin data that the same-origin policy would otherwise protect.

Root Cause

The root cause is missing or insufficient bounds checking within a Skia rendering routine on the macOS build. When Skia parses or rasterizes attacker-controlled graphics inputs, it dereferences a pointer or index beyond the allocated buffer. The resulting read exposes adjacent memory contents to the compromised renderer, which can then exfiltrate the data to an attacker-controlled server.

Attack Vector

The attack vector is network-based with user interaction required. A victim visits a malicious or compromised web page that has first exploited a separate renderer bug. The attacker then invokes Skia through canvas operations, SVG rendering, or image decoding paths to trigger the out-of-bounds read. Refer to the Chromium Issue Tracker Entry for technical details.

// No verified proof-of-concept code is publicly available.
// See the Chromium issue tracker for restricted technical details.

Detection Methods for CVE-2026-13820

Indicators of Compromise

Chrome browser processes on macOS running versions earlier than 150.0.7871.47 after the patch release date.
Renderer process crashes or abnormal memory access patterns tied to libskia or Chrome's GPU/rendering threads.
Outbound connections from Chrome renderer processes to unfamiliar domains immediately after loading untrusted content.

Detection Strategies

Inventory installed Chrome versions across macOS fleets and flag any host running a build older than 150.0.7871.47.
Monitor macOS endpoint telemetry for Chrome renderer crashes referencing Skia symbols, which may indicate exploitation attempts.
Correlate web proxy logs with endpoint browsing telemetry to identify users visiting pages that trigger renderer instability.

Monitoring Recommendations

Enable Chrome enterprise reporting to centralize version and crash telemetry for macOS endpoints.
Track Chromium security release notes and align vulnerability management SLAs to the Chrome Stable channel cadence.
Alert on repeated Chrome helper process terminations that coincide with browsing sessions to low-reputation domains.

How to Mitigate CVE-2026-13820

Immediate Actions Required

Update Google Chrome on all macOS endpoints to version 150.0.7871.47 or later through managed software distribution.
Force a browser restart after update deployment to ensure the patched Skia code is loaded into memory.
Verify the effective Chrome version on each host using chrome://version or MDM inventory reporting.

Patch Information

Google released the fix in the Chrome Stable channel update for desktop. Administrators should deploy Chrome 150.0.7871.47 or later on macOS. Full release details are available in the Google Chrome Stable Update advisory.

Workarounds

Restrict browsing to trusted sites through enterprise web filtering until patches are fully deployed.
Enable Chrome's Site Isolation and Enhanced Safe Browsing to raise the cost of chaining renderer compromises with this bug.
Consider temporarily disabling non-essential rendering features and untrusted extensions on high-risk macOS endpoints.

bash

# Verify installed Chrome version on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version

# Enforce minimum Chrome version via MDM configuration profile (example key)
# TargetVersionPrefix = "150.0.7871.47"