CVE-2026-15770: Google Chrome Information Disclosure Flaw

CVE-2026-15770 Overview

CVE-2026-15770 is an uninitialized memory use vulnerability in the V8 JavaScript engine of Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.125 and allows a remote attacker to read potentially sensitive information from process memory. Exploitation requires a victim to visit a crafted HTML page. Chromium security engineers rated the underlying issue as High severity, while the National Vulnerability Database assigns a Medium rating. The vulnerability is tracked under CWE-457: Use of Uninitialized Variable.

Critical Impact
A remote attacker can leak sensitive process memory contents from the Chrome renderer by convincing a user to load a malicious web page, potentially exposing data useful for chaining further browser exploits.

Affected Products

Google Chrome versions prior to 150.0.7871.125 (Desktop, Stable channel)
Chromium-based browsers embedding the vulnerable V8 build
Applications relying on the affected V8 engine version

Discovery Timeline

2026-07-14 - CVE-2026-15770 published to NVD
2026-07-15 - Last updated in NVD database

Technical Details for CVE-2026-15770

Vulnerability Analysis

The vulnerability resides in V8, the JavaScript and WebAssembly engine that executes untrusted script content in Chrome's renderer process. V8 allocates internal objects, stack slots, and buffers to support just-in-time (JIT) compilation and runtime execution of JavaScript. When one of these memory regions is read before being fully initialized, the engine operates on residual data left over from prior allocations.

An attacker who serves a crafted HTML page can trigger the flawed code path from JavaScript and observe side effects of the uninitialized read. This exposes bytes of process memory that may contain pointers, object metadata, or fragments of prior browsing data. While the flaw does not directly grant code execution, memory disclosure primitives are frequently combined with memory corruption bugs to defeat Address Space Layout Randomization (ASLR).

Root Cause

The root cause is a missing initialization step for a V8 memory region prior to its first read, classified as CWE-457: Use of Uninitialized Variable. Detailed patch analysis is restricted while the Chromium issue tracker entry #524792614 remains under embargo, following Google's standard practice of withholding technical details until the majority of users have updated.

Attack Vector

Exploitation is network-based and requires user interaction. The victim must load attacker-controlled HTML, either by visiting a malicious site directly or by rendering hostile content through an iframe, malvertisement, or compromised third-party resource. No authentication or elevated privileges are required. Once the crafted script executes in the renderer, the attacker exfiltrates leaked memory bytes back to a controlled server for offline analysis.

No public proof-of-concept code or exploit is currently available for CVE-2026-15770. Readers seeking additional technical context should consult the Google Chrome Stable Channel Update.

Detection Methods for CVE-2026-15770

Indicators of Compromise

Chrome renderer processes running versions earlier than 150.0.7871.125 after the patch release window
Outbound connections from browser processes to unfamiliar domains immediately after visiting untrusted sites
HTML or JavaScript payloads containing atypical V8-specific object manipulation patterns designed to trigger uninitialized reads

Detection Strategies

Inventory installed Chrome and Chromium-derivative browser versions across the estate and flag any build below 150.0.7871.125.
Correlate web proxy logs with browser telemetry to identify users visiting URLs hosting suspicious HTML content followed by anomalous outbound data flows.
Monitor endpoint telemetry for renderer process crashes or unusual child-process spawning from chrome.exe, which may indicate exploitation attempts chained with additional vulnerabilities.

Monitoring Recommendations

Enable browser management policies that report installed browser versions to a central inventory system.
Ingest DNS and HTTP proxy logs into a SIEM to hunt for domains flagged in browser-exploitation threat intelligence feeds.
Track EPSS scoring changes for this CVE; the current EPSS probability is 0.315% (percentile 23.628) as of 2026-07-20, and any increase may indicate emerging exploit activity.

How to Mitigate CVE-2026-15770

Immediate Actions Required

Update Google Chrome to version 150.0.7871.125 or later on all Windows, macOS, and Linux endpoints.
Restart Chrome after the update to ensure the patched V8 engine is loaded into all renderer processes.
Audit Chromium-based browsers such as Microsoft Edge, Brave, Opera, and Vivaldi and apply their corresponding upstream patches.

Patch Information

Google addressed CVE-2026-15770 in the Chrome Stable channel release 150.0.7871.125. The fix is described in the Google Chrome Stable Channel Update for Desktop. Enterprise administrators should distribute the update through existing patch management workflows or Chrome Browser Cloud Management. Additional technical context is tracked in Chromium Issue #524792614.

Workarounds

Restrict browsing to trusted sites using web filtering or DNS-based reputation services until patches are fully deployed.
Enable Chrome Site Isolation to reduce cross-origin memory exposure, though this does not eliminate the underlying flaw.
Disable JavaScript for high-risk user groups via enterprise policy where the operational impact is acceptable, as exploitation requires V8 script execution.

bash

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

# Enforce minimum Chrome version via enterprise policy (Windows registry example)
reg add "HKLM\Software\Policies\Google\Chrome" /v "MinimumBrowserVersion" /t REG_SZ /d "150.0.7871.125" /f