CVE-2026-106233: Google Chrome Use After Free Vulnerability

CVE-2026-106233 Overview

CVE-2026-106233 is a use-after-free vulnerability [CWE-416] in the Metrics component of Google Chrome versions prior to 155.0.8059.39. A remote attacker who has already compromised the renderer process can leverage the flaw to execute arbitrary code outside the Chrome sandbox by serving a crafted HTML page. Google's Chromium team rated the underlying security severity as High. The flaw affects the browser process boundary, meaning successful exploitation breaks a core security guarantee of Chrome's multi-process architecture.

Critical Impact
Successful exploitation enables sandbox escape and arbitrary code execution in the browser process context, giving attackers broad access to the host system.

Affected Products

Google Chrome versions prior to 155.0.8059.39 (Desktop)
Chromium-based browsers that incorporate the vulnerable Metrics component
All platforms supported by the Chrome Stable channel (Windows, macOS, Linux)

Discovery Timeline

2026-10-06 - CVE-2026-106233 published to the National Vulnerability Database
2026-10-07 - NVD record last modified

Technical Details for CVE-2026-106233

Vulnerability Analysis

The vulnerability exists in the Metrics component of Google Chrome, which collects and processes telemetry across browser subsystems. A use-after-free condition occurs when the code dereferences a pointer to memory that has already been released. An attacker who controls a compromised renderer process can trigger the dangling pointer path and manipulate reclaimed heap memory. This primitive allows code execution in the privileged browser process, bypassing the renderer sandbox.

The flaw requires a two-stage attack chain. The adversary first compromises the renderer through a separate bug or malicious web content, then abuses CVE-2026-106233 to break out of the sandbox. The attack complexity reflects this chained prerequisite and the user interaction needed to visit a crafted page.

Root Cause

The root cause is improper object lifetime management inside Chrome's Metrics code. A reference to a Metrics-related object persists after the backing allocation is freed. Subsequent operations on that stale reference read or write freed memory, creating an exploitable condition classified under [CWE-416].

Attack Vector

Exploitation requires network delivery of a crafted HTML page and user interaction to load it. The attacker must already have code execution within the renderer process. Once that foothold exists, the crafted content drives the Metrics interaction that triggers the use-after-free, producing a sandbox escape with scope change to the browser process. Google and Chromium have not published exploit details. See the Chromium Issue #565797213 tracker for upstream details.

Detection Methods for CVE-2026-106233

Indicators of Compromise

Chrome browser processes spawning unexpected child processes such as command interpreters or script hosts following a browsing session
Renderer process crashes with heap corruption signatures (for example, EXCEPTION_ACCESS_VIOLATION in heap-managed memory) preceding anomalous browser process activity
Outbound network connections from chrome.exe to unfamiliar domains immediately after rendering untrusted content
Modifications to the Chrome user data directory or persistence artifacts written by the browser process

Detection Strategies

Monitor for Chrome process trees where the browser process executes non-standard binaries, indicating a possible sandbox escape
Correlate Chrome crash telemetry with subsequent process creation and file write events on the same host
Deploy behavioral analytics that flag unusual memory allocation patterns and child-process relationships originating from browser processes
Alert on Chrome versions below 155.0.8059.39 reported by endpoint inventory sources

Monitoring Recommendations

Ingest browser crash reports and process creation events into a centralized data lake for correlation
Track Chrome version compliance across the fleet and generate alerts for hosts running vulnerable builds
Monitor for exploit kit indicators and malicious landing pages targeting Chromium-based browsers

How to Mitigate CVE-2026-106233

Immediate Actions Required

Update Google Chrome to version 155.0.8059.39 or later across all managed endpoints
Restart Chrome after patching to ensure the updated binary is loaded into memory
Audit endpoint management tooling to confirm automatic Chrome updates are enabled and functioning
Prioritize patching for high-value users and systems that routinely browse untrusted content

Patch Information

Google released the fix in the Chrome Stable channel update documented in the Google Chrome Desktop Update advisory. The patched version is 155.0.8059.39. Enterprise administrators should verify deployment through Chrome Browser Cloud Management or equivalent patch management tooling.

Workarounds

No vendor-supplied workaround exists; patching is the required remediation
Restrict browsing to trusted sites via web filtering or isolation technology until patches are applied
Enforce site isolation and strict policies that limit JavaScript execution on untrusted origins
Consider temporary use of alternative hardened browser configurations for high-risk roles

bash

# Verify installed Chrome version on Windows
"%ProgramFiles%\Google\Chrome\Application\chrome.exe" --version

# Verify installed Chrome version on Linux
google-chrome --version

# Expected output: Google Chrome 155.0.8059.39 or later