Google Chrome WebRTC Heap Overflow Allows Sandbox Escape
The National Vulnerability Database has disclosed CVE-2026-9119, a high-severity heap buffer overflow vulnerability in WebRTC within Google Chrome. This flaw, present in versions prior to 148.0.7778.179, allows a remote attacker to achieve arbitrary code execution inside the Chrome sandbox. The CVSS score is a critical 8.8 (HIGH).
Attackers can exploit this by enticing a user to visit a specially crafted HTML page. While the initial execution is sandboxed, buffer overflows are notorious for enabling subsequent sandbox escapes, leading to full system compromise. This isn’t a theoretical risk; it’s a direct path to an attacker running arbitrary code on a user’s machine.
For defenders, this means immediate patching is non-negotiable. Google Chrome’s widespread use makes this a prime target for initial access. Organizations must ensure all endpoints running Chrome are updated to version 148.0.7778.179 or later to mitigate this significant risk. Don’t drag your feet.
What This Means For You
- If your organization relies on Google Chrome, your users are exposed to arbitrary code execution via crafted web pages. Prioritize patching all Chrome instances to version 148.0.7778.179 or newer immediately. This isn't a 'monitor for exploitation' scenario; it's a 'patch now' directive.
Related ATT&CK Techniques
🛡️ Detection Rules
4 rules · 6 SIEM formats4 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Web Application Exploitation Attempt — CVE-2026-9119
title: Web Application Exploitation Attempt — CVE-2026-9119
id: scw-2026-05-20-1
status: experimental
level: high
description: |
Detects common exploitation patterns targeting web applications. Review CVE-2026-9119 advisories for specific indicators.
author: SCW Feed Engine (auto-generated)
date: 2026-05-20
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-9119/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- '..'
- 'SELECT'
- 'UNION'
- '<script'
- 'cmd='
- '/etc/passwd'
condition: selection
falsepositives:
- Legitimate activity from CVE-2026-9119
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-9119 | Buffer Overflow | Heap buffer overflow in WebRTC |
| CVE-2026-9119 | RCE | Google Chrome prior to version 148.0.7778.179 |
| CVE-2026-9119 | Code Injection | Execute arbitrary code inside a sandbox via a crafted HTML page |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 20, 2026 at 23:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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