CVE-2026-7902: Google Chrome V8 RCE Vulnerability

CVE-2026-7902 Overview

CVE-2026-7902 is an out-of-bounds memory access vulnerability in the V8 JavaScript engine used by Google Chrome. The flaw affects Chrome versions prior to 148.0.7778.96 and allows a remote attacker to execute arbitrary code inside the Chrome sandbox by serving a crafted HTML page. Chromium classifies the security severity as High. The vulnerability is tracked under [CWE-787] and impacts Chrome installations across Windows, macOS, and Linux. Successful exploitation requires user interaction, typically by enticing a target to visit a malicious or compromised website.

Critical Impact

Remote attackers can execute arbitrary code inside the Chrome sandbox through a single visit to a crafted HTML page, providing a foothold for further sandbox escape and full system compromise.

Affected Products

• Google Chrome prior to 148.0.7778.96
• Chrome on Microsoft Windows, Apple macOS, and Linux
• Chromium-based browsers and embedded WebViews using vulnerable V8 builds

Discovery Timeline

• 2026-05-06 - CVE-2026-7902 published to NVD
• 2026-05-06 - Last updated in NVD database
• 2026-05 - Google releases Stable Channel update for Desktop addressing the issue (Chrome Releases blog)

Technical Details for CVE-2026-7902

Vulnerability Analysis

The vulnerability resides in V8, the JavaScript and WebAssembly engine that powers Chrome. V8 performs out-of-bounds memory access when processing specific JavaScript constructs, allowing an attacker to read or write beyond the bounds of an allocated buffer. This memory corruption primitive enables arbitrary code execution within the renderer process. The renderer runs inside the Chrome sandbox, so direct system compromise requires chaining this flaw with a separate sandbox escape. Attackers commonly pair V8 bugs with sandbox escapes to achieve full remote code execution. The crafted HTML page delivers attacker-controlled JavaScript that triggers the unsafe access pattern.

Root Cause

The root cause is improper bounds checking in V8, mapped to [CWE-787] Out-of-bounds Write. Optimizing compilers and runtime routines in V8 can mishandle object shapes, typed array indices, or speculative assumptions, producing memory writes outside intended buffer limits. The Chromium issue tracker entry at issues.chromium.org/502030575 documents the underlying defect, with public details restricted until broad patch deployment.

Attack Vector

Exploitation occurs over the network and requires user interaction. A victim must load attacker-controlled HTML in Chrome, either through a direct visit, a malicious advertisement, an iframe on a compromised site, or a phishing link. No authentication is required. Once the page loads, the embedded JavaScript triggers the out-of-bounds access in V8, corrupting renderer memory and pivoting to arbitrary code execution inside the sandboxed renderer process.

No public proof-of-concept code is available for CVE-2026-7902 at the time of writing. Refer to the Chromium Issue Tracker entry for technical details as they become public.

Detection Methods for CVE-2026-7902

Indicators of Compromise

• Chrome renderer processes (chrome.exe --type=renderer) crashing or spawning unexpected child processes after visiting external sites
• Outbound network connections from renderer processes to uncommon hosts following web browsing
• New persistence artifacts, such as scheduled tasks or autorun entries, created shortly after Chrome activity
• Browser telemetry showing Chrome versions older than 148.0.7778.96 still in active use

Detection Strategies

• Inventory installed Chrome versions across the fleet and flag any build below 148.0.7778.96 as vulnerable
• Hunt for anomalous process trees where chrome.exe renderer children launch shells, scripting hosts, or LOLBins
• Correlate web proxy logs with endpoint telemetry to surface visits to suspicious domains preceding renderer crashes

Monitoring Recommendations

• Enable browser crash and exploit telemetry forwarding to the SIEM for centralized analysis
• Monitor for memory access violations and Windows Error Reporting events tied to chrome.exe
• Track Chrome auto-update status and alert on endpoints where updates are stalled or disabled

How to Mitigate CVE-2026-7902

Immediate Actions Required

• Update Google Chrome to version 148.0.7778.96 or later on all Windows, macOS, and Linux endpoints
• Restart Chrome after updates so the patched V8 binary is loaded into all renderer processes
• Patch Chromium-based browsers and embedded WebView components that bundle vulnerable V8 builds
• Restrict execution of untrusted JavaScript through enterprise browsing policies where feasible

Patch Information

Google addressed CVE-2026-7902 in the Chrome Stable Channel update for Desktop, version 148.0.7778.96. Refer to the Stable Channel Update for Desktop advisory for release notes and the full list of fixes. Enterprises should validate auto-update enrollment and confirm patched builds via management consoles or endpoint inventory tools.

Workarounds

• Block access to untrusted websites through web proxy or DNS filtering until patching is complete
• Deploy site isolation and strict Content Security Policies for internal applications
• Use enterprise browser policies to disable unnecessary JavaScript features on high-risk user groups
• Treat Chrome on unpatched endpoints as high risk and prioritize them for accelerated update cycles

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

# Verify Chrome version on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version

# Verify Chrome version on Windows (PowerShell)
(Get-Item "$Env:ProgramFiles\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion

# Expected: 148.0.7778.96 or later