CVE-2026-113027 Overview
CVE-2026-113027 is a memory corruption vulnerability in the WebFonts component of Google Chrome. The flaw affects Chrome versions prior to 156.0.8078.47 and can be triggered by a crafted HTML page. A remote attacker who convinces a user to visit a malicious page can potentially execute arbitrary code inside the Chrome renderer sandbox. The issue is classified under CWE-119, covering improper restriction of operations within the bounds of a memory buffer. Google rated the Chromium security severity as Low, while the NVD assigned a higher CVSS score reflecting the potential for code execution.
Critical Impact
Successful exploitation enables arbitrary code execution inside the Chrome renderer sandbox following a single visit to a malicious web page.
Affected Products
- Google Chrome versions prior to 156.0.8078.47
- Chromium-based browsers incorporating the vulnerable WebFonts code
- Desktop Chrome Stable channel across supported platforms
Discovery Timeline
- 2026-10-20 - CVE-2026-113027 published to NVD
- 2026-10-21 - Last updated in NVD database
Technical Details for CVE-2026-113027
Vulnerability Analysis
The vulnerability resides in Chrome's WebFonts implementation, the component responsible for downloading, parsing, and rasterizing fonts referenced from web content. Memory corruption in this subsystem allows a crafted font or HTML construct to corrupt renderer process memory. An attacker who achieves control over corrupted memory can redirect execution flow and run arbitrary code inside the sandboxed renderer. Exploitation requires user interaction, specifically loading a malicious HTML page in a vulnerable Chrome build. The CWE-119 classification indicates the root issue is an operation performed outside the intended bounds of a memory buffer.
Root Cause
The root cause is improper memory boundary handling within the WebFonts code path. Font processing requires parsing complex binary structures, and incorrect size validation or lifetime tracking in these routines produces exploitable corruption. Google has not publicly disclosed the specific allocation or object type involved. Technical details are tracked in Chromium Issue #505807063.
Attack Vector
The attack vector is network-based and requires user interaction. An attacker hosts a crafted HTML page that references a malicious WebFont or triggers a vulnerable font-processing path. When a victim visits the page in an unpatched Chrome build, the renderer processes the attacker-controlled font data and corrupts memory. Code execution remains confined to the renderer sandbox unless chained with a sandbox escape. No public proof-of-concept or in-the-wild exploitation has been reported for this issue.
No verified exploit code is publicly available. Refer to the Google Chrome Stable Update advisory for release details.
Stop Remote Code Execution Before It Runs
Singularity™ Endpoint detects and blocks exploit attempts at machine speed, including zero-days and novel attack techniques.
Stop Exploit AttemptsDetection Methods for CVE-2026-113027
Indicators of Compromise
- Unexpected Chrome renderer process crashes with memory access violations following navigation to untrusted pages
- Outbound requests from browser hosts to unfamiliar domains serving .woff, .woff2, .ttf, or .otf files from recently registered infrastructure
- Chrome crash dumps referencing the WebFonts, FreeType, or font rasterization components
Detection Strategies
- Inventory installed Chrome versions across managed endpoints and flag any build earlier than 156.0.8078.47
- Correlate browser crash telemetry with web proxy logs to surface font resources that preceded renderer failures
- Monitor for child processes or anomalous network connections spawned from chrome.exe renderer processes shortly after page loads
Monitoring Recommendations
- Enable Chrome crash reporting and forward reports to a centralized analytics pipeline for triage
- Alert on executions of chrome.exe renderer processes that spawn shells, scripting interpreters, or persistence tooling
- Track user agent and version strings in web gateway logs to identify endpoints lagging on Chrome updates
How to Mitigate CVE-2026-113027
Immediate Actions Required
- Update Google Chrome to version 156.0.8078.47 or later on all managed endpoints
- Restart Chrome after installing the update so the patched binary is loaded into memory
- Audit Chromium-based browsers and embedded WebViews for comparable updates from their vendors
Patch Information
Google addressed the vulnerability in Chrome Stable 156.0.8078.47. Deployment details and the full list of fixes shipped in the same release are documented in the Google Chrome Stable Update advisory. Enterprises managing Chrome through group policy or Chrome Browser Cloud Management should validate that automatic updates completed and that no policy pins clients to an older channel.
Workarounds
- Enforce Chrome auto-update through enterprise policy to minimize exposure windows for future browser CVEs
- Restrict browsing to trusted sites via web filtering while the patch is being deployed
- Consider disabling downloadable WebFonts through enterprise policy on high-risk hosts until patching completes
# Verify installed Chrome version on Linux endpoints
google-chrome --version
# Example Windows registry check for Chrome version
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
