CVE-2026-113034 Overview
CVE-2026-113034 is a memory corruption vulnerability in the FileSystem component of Google Chrome prior to version 156.0.8078.47. A remote attacker can execute arbitrary code inside the Chrome sandbox by serving a crafted HTML page to a target user. The flaw is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). Chromium rates the security severity as Medium, while NVD assigns a higher base score reflecting the network attack vector and impact on confidentiality, integrity, and availability. Exploitation requires user interaction, specifically visiting an attacker-controlled page.
Critical Impact
A remote attacker can achieve arbitrary code execution within the Chrome renderer sandbox by convincing a user to load a malicious HTML page.
Affected Products
- Google Chrome Desktop versions prior to 156.0.8078.47
- Chromium-based browsers that embed the vulnerable FileSystem component
- Downstream distributions tracking the Chrome Stable channel
Discovery Timeline
- 2026-10-20 - CVE-2026-113034 published to NVD
- 2026-10-21 - Last updated in NVD database
Technical Details for CVE-2026-113034
Vulnerability Analysis
The vulnerability resides in the Chrome FileSystem component, which manages sandboxed storage for web applications through the File System and File System Access APIs. Memory corruption in this subsystem allows attacker-controlled data to influence process memory handling in the renderer. Successful exploitation yields arbitrary code execution inside the Chrome sandbox. While the sandbox limits direct host compromise, in-sandbox code execution is routinely chained with a sandbox escape to achieve full system compromise. The attack requires only that a user navigate to a crafted page, making phishing, malvertising, and watering-hole campaigns viable delivery methods.
Root Cause
The underlying weakness is improper restriction of operations within the bounds of a memory buffer ([CWE-119]). The FileSystem code path mishandles buffer boundaries or object lifetimes when processing crafted inputs, enabling an attacker to corrupt adjacent memory structures. Google has not published low-level technical details while patch adoption is in progress. Refer to the Chromium Issue #497482008 tracker for status updates.
Attack Vector
Exploitation proceeds through the browser's network-facing attack surface. An attacker hosts a crafted HTML page that invokes the vulnerable FileSystem code path through JavaScript APIs. When a victim loads the page, the renderer processes the malicious content and triggers memory corruption. The attacker gains code execution within the renderer process. No credentials or prior access are required, but the victim must interact with the attacker-controlled page.
No public proof-of-concept code is available at the time of writing. See the Google Chrome Desktop Update advisory for official details.
Stop Remote Code Execution Before It Runs
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Stop Exploit AttemptsDetection Methods for CVE-2026-113034
Indicators of Compromise
- Chrome renderer processes crashing with memory access violations shortly after visiting unfamiliar web pages
- Unexpected child processes spawned from chrome.exe or the Chrome helper processes on macOS and Linux
- Outbound connections from browser processes to low-reputation domains following a page load
- Browser crash dumps referencing the FileSystem component or sandboxed storage subsystem
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag any build prior to 156.0.8078.47
- Monitor browser process telemetry for anomalous memory allocation patterns and crash signatures tied to the FileSystem component
- Correlate web proxy logs with endpoint telemetry to identify users who visited suspect pages prior to a renderer crash
Monitoring Recommendations
- Enable crash reporting and centralize browser crash telemetry for review
- Alert on new or unsigned processes launched as children of browser processes
- Track DNS and HTTP telemetry for connections to newly registered or uncategorized domains originating from browser sessions
How to Mitigate CVE-2026-113034
Immediate Actions Required
- Update Google Chrome to version 156.0.8078.47 or later on all managed endpoints
- Force-restart browser sessions after deploying the patch to ensure the updated binary is active
- Audit Chromium-derived browsers and embedded WebViews for equivalent updates from their maintainers
Patch Information
Google released the fix in the Chrome Stable channel at version 156.0.8078.47. Deployment details and release notes are available in the Google Chrome Desktop Update advisory. Enterprises using Chrome Browser Enterprise policies should push the update through their standard management channel.
Workarounds
- Restrict browsing to trusted sites through enterprise policy or secure web gateway controls until the patch is deployed
- Disable or restrict the File System Access API via Chrome enterprise policy where business workflows allow
- Enforce site isolation and ensure the renderer sandbox is enabled on all managed systems
# Verify installed Chrome version on Linux endpoints
google-chrome --version
# Example Chrome enterprise policy snippet to block the File System Access API
# File: /etc/opt/chrome/policies/managed/filesystem_restrict.json
{
"DefaultFileSystemReadGuardSetting": 2,
"DefaultFileSystemWriteGuardSetting": 2
}
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
