CVE-2026-14415: Chrome V8 Heap Corruption via Crafted HTML – CVSS 8.8 HIGH

Technical summary

CVE-2026-14415 stems from inappropriate implementation in the V8 JavaScript engine bundled in Chromium and Google Chrome. The vulnerability manifests as a heap buffer overflow (CWE-122) triggered by specially crafted HTML markup combined with specific user gestures on the affected webpage. The heap corruption occurs within V8's memory management, potentially allowing an attacker to overwrite adjacent heap structures, corrupt object metadata, or achieve out-of-bounds write conditions. The Chromium security team classified the issue as Low severity from a design perspective, yet the CVSS 3.1 score of 8.8 reflects the high impact of successful exploitation: confidentiality breach, integrity violation, and availability impact all rated High due to the potential for code execution in the renderer process.

Business impact

Successful exploitation allows arbitrary code execution within Chrome's renderer process, potentially exposing user data, session tokens, and locally stored credentials. An attacker cannot escalate directly to the operating system without chaining additional vulnerabilities, but compromise of the renderer permits credential theft, form data capture, and manipulation of web content. Organizations relying on Chrome for sensitive workflows—financial services, healthcare, government—face direct data exfiltration risk. The user interaction requirement (specific UI gestures) reduces attack surface compared to purely passive exploitation but remains practical in spear-phishing or watering-hole scenarios targeting high-value users.

Affected systems

Google Chrome versions prior to 150.0.7871.46 are affected. All platforms running vulnerable Chrome releases—Windows, macOS, Linux, Android, iOS—are in scope. Users of Chromium-based browsers that integrate unpatched V8 (Edge, Brave, Opera) may also be affected if they have not received corresponding security updates. The vulnerability does not affect Chrome OS systems running Chrome from the managed update channel if they have already received patch 150.0.7871.46 or later.

Exploitability

Exploitation requires convincing a user to visit a malicious webpage and engage in specific UI gestures—e.g., clicking, typing, or selecting content in a particular sequence. The attack is not passive or silent; active user participation is necessary. No authenticated access is required, and the attacker's payload is delivered remotely via crafted HTML. While the user interaction barrier raises the difficulty above 'network attack requiring no user action,' it remains exploitable in realistic threat scenarios: targeted phishing emails with compelling pretext, watering-hole attacks against industry-specific websites, or malicious ads on compromised web properties can all reliably trigger the necessary gestures. Automated exploit frameworks can be constructed once the gesture pattern is reverse-engineered from public proof-of-concept analysis.

Remediation

Update Google Chrome to version 150.0.7871.46 or later. Chrome's automatic update mechanism will push patches to users over the course of several hours; verify deployment via chrome://version in the address bar (ensure version number meets or exceeds the patched release). Users can manually trigger updates via Settings > About Chrome > Update. Administrators managing Chrome deployments should use policy configuration to enforce automatic updates or force restarts to ensure all instances are patched within a defined window. No workarounds exist short of disabling JavaScript or avoiding untrusted websites.

Patch guidance

Verify patched Chrome version via chrome://version. For managed deployments, confirm that the Chrome Policy /etc/chromium/policies/managed (Linux), Windows Registry entries for Chrome policies, or macOS configuration profiles enforce automatic updates. If manual patching is required, download the latest stable release from google.com/chrome. Test critical web applications post-patch to ensure renderer stability and compatibility. Monitor Chrome update logs (Windows Event Viewer under Applications and Services Logs > Google Chrome, or macOS Console for Chromium logs) to confirm successful rollout. No rollback is recommended; the patch addresses a memory safety regression with no reported side effects.

Detection guidance

Monitor for crashes or hangs in Chrome renderer processes (Task Manager on Windows, Activity Monitor on macOS, or system logs). Inspect JavaScript console errors for anomalies indicating heap corruption (e.g., unexpected TypeErrors, JSTypedArray out-of-bounds exceptions). Network detection: log and inspect unusual HTML payloads served to users—look for obfuscated JavaScript, uncommon iframe nesting, or large Base64-encoded data blobs. Endpoint Detection and Response (EDR) tools can flag suspicious memory writes or unusual V8 process behavior. User reports of 'Chrome crashing on a specific website' may indicate exploitation attempts. Correlation of crash dumps with patch version can help identify systems still running vulnerable releases.

Why prioritize this

Despite Chromium's internal Low severity rating, this CVE scores 8.8 (HIGH) under CVSS 3.1 due to confidentiality, integrity, and availability impact all rated High. Heap corruption in a JavaScript engine is a critical primitive for code execution. The requirement for user interaction prevents it from being critical, but in targeted attacks against high-value individuals or in watering-hole scenarios, it poses significant risk. Organizations should prioritize patching within 72 hours for user-facing systems and within 24 hours for systems accessing sensitive data or handling authentication. The attack surface (any website visited) and the data exposure potential (session cookies, form data, cached credentials) justify urgent deployment.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH) reflects: (1) Network Attack Vector—the payload is delivered remotely via HTTP(S); (2) Low Attack Complexity—no special conditions or configuration bypass is required beyond user interaction; (3) No Privileges or Preconditions—an unauthenticated attacker can initiate the exploit; (4) Required User Interaction—specific UI gestures are necessary, capping the score below Critical; (5) Unchanged Scope—the impact is contained within the renderer process, not system-wide; (6) High Confidentiality, Integrity, and Availability Impact—successful exploitation allows data theft, code injection, and denial of service. The score accurately reflects real-world risk: this is not a critical OS-level flaw, but it is a serious application-level vulnerability enabling credential and data theft.

Frequently asked questions