CVE-2026-15126: Google Chrome Use After Free Vulnerability

CVE-2026-15126 Overview

CVE-2026-15126 is a use-after-free vulnerability in the Forms component of Google Chrome prior to version 150.0.7871.115. A remote attacker can trigger the flaw through a crafted HTML page and execute arbitrary code inside the browser sandbox. Google classifies the Chromium security severity as High. The issue is tracked as [CWE-416] and affects the Chrome Stable channel on desktop platforms. Successful exploitation requires user interaction, specifically visiting an attacker-controlled or compromised web page. While the resulting code execution is contained by the Chromium sandbox, use-after-free flaws in renderer components are historically chained with sandbox escape bugs to achieve full system compromise.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome renderer sandbox by luring users to a crafted HTML page, providing a foothold for further sandbox escape and full browser compromise.

Affected Products

Google Chrome Desktop versions prior to 150.0.7871.115
Chromium-based browsers incorporating the vulnerable Forms component
All desktop platforms (Windows, macOS, Linux) running affected Chrome builds

Discovery Timeline

2026-07-08 - CVE-2026-15126 published to NVD
2026-07-09 - Last updated in NVD database

Technical Details for CVE-2026-15126

Vulnerability Analysis

The vulnerability is a use-after-free (UAF) condition within the Forms subsystem of Blink, the rendering engine used by Chrome. Use-after-free bugs occur when a program continues to reference memory after it has been released back to the allocator. An attacker who controls page content can trigger allocation and free operations in a specific order, then reclaim the freed object with attacker-controlled data. Once the dangling pointer is dereferenced, the attacker gains control over object function pointers or virtual table entries. In the context of the Forms component, this typically involves DOM elements associated with <form>, <input>, or related controls that maintain references across script-driven lifecycle changes.

Root Cause

The root cause is improper object lifetime management in Chrome's Forms handling code, categorized as [CWE-416] Use After Free. A form-related object is freed while another code path retains a raw pointer to it, and that pointer is later dereferenced. Chromium's issue tracker entry #523748081 documents the specific defect, though technical details remain restricted until broad patch adoption.

Attack Vector

Exploitation requires a network attack vector with user interaction. A victim must load a crafted HTML page delivered through phishing, malvertising, watering-hole compromise, or embedded content on trusted sites. The page uses JavaScript to manipulate form elements in a manner that triggers the free-then-use sequence. Successful exploitation yields arbitrary code execution inside the renderer process, which remains confined by the Chromium sandbox unless combined with a separate sandbox escape.

No public proof-of-concept exploit is currently available. The vulnerability mechanism is described in prose because verified exploitation code has not been published. Refer to the Chromium Issue Tracker #523748081 and the Google Chrome Stable Update advisory for authoritative technical references.

Detection Methods for CVE-2026-15126

Indicators of Compromise

Chrome renderer process crashes or unexpected terminations coinciding with visits to untrusted web pages
Unexpected child processes spawned by chrome.exe on Windows or the Chrome helper on macOS and Linux
Outbound connections from Chrome renderer processes to unknown domains hosting obfuscated JavaScript
Presence of Chrome installations reporting versions earlier than 150.0.7871.115

Detection Strategies

Inventory installed Chrome versions across the fleet and flag any host running a build older than 150.0.7871.115
Monitor endpoint telemetry for renderer process crashes with heap corruption signatures such as access violations at freed heap addresses
Inspect web proxy logs for HTML responses containing anomalous form manipulation patterns targeting Blink
Correlate browser crash reports with subsequent process injection or persistence activity on the same host

Monitoring Recommendations

Ingest browser telemetry and process lineage into a centralized data lake for retrospective hunting once patch adoption completes
Alert on Chrome renderer processes launching shell interpreters, powershell.exe, cmd.exe, or scripting hosts
Track EPSS score changes for CVE-2026-15126 to detect rising exploitation likelihood
Enable Chrome Enterprise reporting to forward crash and security events to SIEM platforms

How to Mitigate CVE-2026-15126

Immediate Actions Required

Update Google Chrome to version 150.0.7871.115 or later on all desktop endpoints without delay
Restart Chrome after update to ensure the patched binary is loaded across all sessions
Force update Chromium-based derivatives (Edge, Brave, Opera, Vivaldi) once vendors ship rebased releases
Verify update rollout through management tooling such as Chrome Browser Cloud Management or MDM policies

Patch Information

Google released the fix in the Chrome Stable channel at version 150.0.7871.115. See the Google Chrome Stable Update release notes for the full advisory. Chromium-based browser vendors incorporate the patch by merging the upstream fix; consult each vendor's release notes to confirm the fix is included in their build.

Workarounds

No supported workaround exists that eliminates the vulnerability without patching
Restrict browsing to trusted sites and block untrusted script execution using enterprise policy where updates cannot be applied immediately
Enable site isolation and strict sandbox policies, which limit the impact of renderer compromise
Deploy web filtering to block known malicious domains and reduce exposure to crafted HTML payloads

bash

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

# Windows: Query Chrome version from registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version

# Enterprise policy: force automatic Chrome updates (Windows registry)
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault /t REG_DWORD /d 1 /f