CVE-2026-7936: Google Chrome Use-After-Free Vulnerability

CVE-2026-7936 Overview

CVE-2026-7936 is an object lifecycle flaw in the V8 JavaScript engine used by Google Chrome before version 148.0.7778.96. The defect allows a remote attacker to trigger an out-of-bounds memory read by serving a crafted HTML page to a victim browser. Google classifies the Chromium security severity as Medium.

The vulnerability falls under [CWE-125] Out-of-Bounds Read. Successful exploitation can disclose adjacent process memory contents from the renderer process. User interaction is required, since the victim must load attacker-controlled web content. Google patched the issue in the Stable channel update for desktop across Windows, macOS, and Linux.

Critical Impact
Remote attackers can read out-of-bounds memory from the V8 renderer through a crafted HTML page, potentially leaking sensitive process data.

Affected Products

Google Chrome prior to 148.0.7778.96 on Microsoft Windows
Google Chrome prior to 148.0.7778.96 on Apple macOS
Google Chrome prior to 148.0.7778.96 on Linux

Discovery Timeline

2026-05-06 - CVE-2026-7936 published to NVD
2026-05-06 - Last updated in NVD database
2026-05 - Google releases Stable channel update for desktop addressing the issue

Technical Details for CVE-2026-7936

Vulnerability Analysis

The vulnerability resides in V8, the JavaScript and WebAssembly engine that executes scripts inside the Chrome renderer process. An object lifecycle issue causes V8 to access memory tied to an object whose lifetime is not properly tracked. The result is an out-of-bounds read [CWE-125] in the renderer's heap.

Object lifecycle defects in V8 typically arise from mismatches between garbage collection state and direct pointer use. When the engine reads beyond the intended bounds of a managed object, it returns adjacent memory that may include pointers, JIT artifacts, or sensitive script state. The leaked data can support follow-on attacks against the renderer sandbox or browser-stored secrets.

Exploitation does not require authentication or local access. The attacker only needs the victim to navigate to a malicious or compromised page that delivers crafted JavaScript triggering the faulty object access path.

Root Cause

The root cause is improper handling of object lifetime within V8, where memory is read past the valid extent of a managed object. The Chromium issue tracker entry #490485402 is restricted while users update, which is standard practice for Chromium memory bugs.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker hosts a crafted HTML page or injects malicious JavaScript into a site the victim visits. When V8 parses and executes the script, the engine performs the out-of-bounds read inside the renderer process. No additional privileges or prior access are needed.

No public proof-of-concept code or exploit has been published for CVE-2026-7936. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Google Chrome Releases advisory for vendor details.

Detection Methods for CVE-2026-7936

Indicators of Compromise

Chrome browser processes running versions earlier than 148.0.7778.96 after the patch release window
Renderer process crashes or unexpected terminations correlated with visits to untrusted domains
Outbound connections from endpoints to newly registered or low-reputation domains hosting JavaScript-heavy pages

Detection Strategies

Inventory installed Chrome versions across managed endpoints and flag any build below 148.0.7778.96
Monitor browser telemetry for repeated V8 renderer crashes that may indicate exploitation attempts
Correlate web proxy logs with threat intelligence on malicious JavaScript delivery infrastructure

Monitoring Recommendations

Track Chrome update compliance through endpoint management tooling and alert on stale versions
Log and review process creation events for chrome.exe child processes with anomalous command lines
Forward browser and endpoint logs to a centralized analytics platform for cross-host pattern detection

How to Mitigate CVE-2026-7936

Immediate Actions Required

Update Google Chrome to version 148.0.7778.96 or later on all Windows, macOS, and Linux endpoints
Restart Chrome after the update so the patched binaries load into active sessions
Verify managed browser policies enforce automatic updates and prevent users from deferring patches

Patch Information

Google released the fix in the Stable channel update for desktop. Administrators should deploy Chrome 148.0.7778.96 or later through their standard software distribution process. Refer to the Google Chrome Releases advisory for the full list of addressed issues. The Chromium tracker reference is issue #490485402.

Workarounds

Restrict browsing to trusted sites using web filtering or allowlist policies until patching completes
Disable JavaScript on high-risk user groups through enterprise policy as a temporary control
Use site isolation and enhanced sandboxing settings to limit the impact of renderer-level memory disclosure

bash

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

# Windows: query installed version via registry
reg query "HKLM\Software\Google\Chrome\BLBeacon" /v version

# macOS: read version from the application bundle
defaults read /Applications/Google\ Chrome.app/Contents/Info CFBundleShortVersionString