CVE-2025-13227: Google Chrome V8 RCE Vulnerability

CVE-2025-13227 Overview

CVE-2025-13227 is a type confusion vulnerability in the V8 JavaScript engine used by Google Chrome. The flaw affects all Chrome versions prior to 142.0.7444.59 on Windows, macOS, and Linux. A remote attacker can exploit heap corruption by serving a crafted HTML page to a target user. Google classifies the Chromium security severity as High and the issue maps to CWE-843: Access of Resource Using Incompatible Type.

Critical Impact

Successful exploitation enables heap corruption in the renderer process, which attackers can chain with sandbox escapes to achieve remote code execution on the host.

Affected Products

• Google Chrome versions prior to 142.0.7444.59 on Windows
• Google Chrome versions prior to 142.0.7444.59 on macOS
• Google Chrome versions prior to 142.0.7444.59 on Linux

Discovery Timeline

• 2025-11-18 - CVE-2025-13227 published to the National Vulnerability Database
• 2025-11-19 - Last updated in NVD database

Technical Details for CVE-2025-13227

Vulnerability Analysis

The vulnerability resides in V8, the JavaScript and WebAssembly engine that powers Chrome's renderer process. Type confusion occurs when code allocates or accesses a memory region using one type but later interprets it as a different, incompatible type. In V8, this class of bug typically arises in optimization paths where the just-in-time (JIT) compiler makes incorrect assumptions about object shapes or element kinds.

When V8 operates on an object under an incorrect type assumption, the engine reads or writes memory based on the wrong layout. Attackers leverage this primitive to corrupt adjacent heap metadata, hijack object pointers, or construct arbitrary read and write capabilities inside the renderer sandbox. The Chromium issue tracking entry #446122633 remains restricted, which is standard practice for unpatched downstream Chromium forks.

Root Cause

The root cause is an incompatible type access within V8 ([CWE-843]). The engine treats a JavaScript object or value as if it belonged to a type it does not, breaking the memory safety guarantees V8 normally enforces through hidden classes and inline caches.

Attack Vector

Exploitation requires a victim to load attacker-controlled HTML and JavaScript content. The attack vector is network-based and requires user interaction such as visiting a malicious site, opening a phishing link, or rendering a compromised advertisement. No authentication or special privileges are required. The vulnerability mechanism is described in prose because no public proof-of-concept is available. See the Google Chrome Stable Update advisory for vendor details.

Detection Methods for CVE-2025-13227

Indicators of Compromise

• Chrome renderer processes crashing with SIGSEGV or EXCEPTION_ACCESS_VIOLATION shortly after navigating to untrusted URLs.
• Unexpected child processes spawned by chrome.exe or the Chrome Helper (Renderer) process, particularly shells or scripting interpreters.
• Outbound network connections from Chrome renderer processes to unknown hosts following visits to suspicious pages.
• Chrome version strings below 142.0.7444.59 reported by endpoint inventory tooling.

Detection Strategies

• Monitor process creation telemetry for anomalous parent-child relationships involving Chrome and command interpreters such as cmd.exe, powershell.exe, bash, or osascript.
• Hunt for renderer crash dumps that contain V8 frames such as v8::internal:: followed by heap corruption signatures.
• Correlate web proxy logs with endpoint browser activity to identify users who reached known malicious domains while running unpatched Chrome builds.

Monitoring Recommendations

• Inventory installed Chrome versions across the fleet and flag any host running a build older than 142.0.7444.59.
• Track Chromium-based browser updates (Edge, Brave, Opera, Vivaldi) that embed V8 and require parallel patching cycles.
• Alert on download events originating from Chrome renderer processes that drop executable content to user-writable paths.

How to Mitigate CVE-2025-13227

Immediate Actions Required

• Update Google Chrome to version 142.0.7444.59 or later on Windows, macOS, and Linux endpoints.
• Force a managed restart of Chrome after deployment so the new binary loads in active user sessions.
• Patch Chromium-derived browsers (Microsoft Edge, Brave, Opera, Vivaldi) once their vendors publish builds that incorporate the V8 fix.
• Audit enterprise extension policies and remove untrusted extensions that could expand the renderer attack surface.

Patch Information

Google released the fix in the Chrome Stable channel as version 142.0.7444.59. Refer to the Google Chrome Stable Channel Update for the official rollout notice and to the restricted Chromium Issue #446122633 for tracking metadata.

Workarounds

• Restrict JavaScript execution on untrusted sites using Chrome enterprise policies such as DefaultJavaScriptSetting when immediate patching is not possible.
• Deploy URL filtering at the proxy or DNS layer to block access to known malicious domains that deliver browser exploits.
• Enforce Site Isolation (--site-per-process) so each origin runs in its own renderer process, limiting cross-site data exposure if heap corruption occurs.

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

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

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