CVE-2026-106207

Executive Summary

CVE-2026-106207 is a race condition vulnerability in the V8 JavaScript engine of Google Chrome affecting versions prior to 155.0.8059.39. A remote attacker can exploit this flaw by convincing a victim to visit a crafted HTML page, potentially achieving arbitrary code execution within the sandbox. With a CVSS score of 8.8, this vulnerability poses a high risk to enterprises relying on Chrome for web browsing, though no public PoC or active exploitation has been observed to date.

Technical Analysis

The vulnerability resides in V8, Chrome's high-performance JavaScript and WebAssembly engine, and is classified as CWE-367 (Time-of-check Time-of-use Race Condition). A race condition occurs when a system's behavior depends on the timing of events, such as the sequence of operations between multiple threads or processes. In the context of V8, this may involve improper synchronization during object property access, optimization, or garbage collection. An attacker could craft a malicious HTML page containing JavaScript that triggers the race condition, leading to memory corruption or type confusion. This could allow an attacker to execute arbitrary code within the sandbox, bypassing Chrome's security boundaries. However, the NVD description provides insufficient technical detail to identify specific functions, classes, or code paths involved. The attack surface is the browser's rendering of untrusted web content, requiring user interaction (visiting the page) but no authentication.

Exploitation Scenarios

1. Reconnaissance: An attacker identifies a target organization using Chrome versions below 155.0.8059.39. This could be done via network scanning or by leveraging known browser version disclosure in HTTP headers or JavaScript.
2. Triggering the flaw: The attacker hosts a crafted HTML page that contains JavaScript designed to exploit the race condition in V8. The victim must visit this page, either through phishing or by visiting a compromised legitimate site.
3. Execution: The race condition is triggered, leading to memory corruption. The attacker leverages this to execute arbitrary code within the sandbox. No public PoC is available; the attack chain is inferred from the vulnerability class.
4. Post-exploitation: Successful exploitation allows code execution inside the sandbox, potentially enabling data theft, further compromise of the system, or lateral movement. However, escaping the sandbox would require an additional vulnerability.

Impact Assessment

The CVSS score of 8.8 (High) reflects a network-accessible vulnerability with low attack complexity and no privileges required, but requiring user interaction. Confidentiality, integrity, and availability impacts are all High. Affected systems include any system running Google Chrome versions prior to 155.0.8059.39, as well as other Chromium-based browsers that have not yet incorporated the fix. The blast radius could be significant, as Chrome is widely used in enterprise environments. Successful exploitation could lead to arbitrary code execution, data exfiltration, and potential lateral movement within the network.

Detection Guidance

Sigma Rule

title: Chrome V8 Race Condition Exploitation Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects potential exploitation of CVE-2026-106207 via crafted HTML page causing V8 race condition.
author: Threat Intelligence Team
date: 2026-06-15
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    Image|endswith: '\chrome.exe'
    CommandLine|contains: '--no-sandbox'
  filter_legitimate:
    CommandLine|contains: '--disable-gpu'
  condition: selection and not filter_legitimate
falsepositives:
  - Legitimate use of --no-sandbox in testing environments
level: high

YARA Rule

rule CVE_2026_106207_Chrome_V8_Race
{
    meta:
        description = "Detects crafted HTML/JS exploiting V8 race condition in Chrome < 155.0.8059.39"
        author = "Threat Intelligence Team"
        date = "2026-06-15"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-106207"
    strings:
        $s1 = "race" ascii nocase
        $s2 = "v8" ascii nocase
        $s3 = "SharedArrayBuffer" ascii nocase
        $s4 = "Atomics" ascii nocase
    condition:
        any of them
}

Suricata IDS Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2026-106207 Chrome V8 Race Condition Exploitation Attempt"; flow:to_server,established; content:"GET"; http_method; content:"/"; http_uri; content:"SharedArrayBuffer"; http_client_body; content:"Atomics"; http_client_body; sid:1000001; rev:1;)

Elastic Detection

process where process.name == "chrome.exe" and process.command_line contains "--no-sandbox"

Splunk SPL Query

index=main sourcetype=WinEventLog:Security EventCode=4688
| search Image="*\\chrome.exe" CommandLine="*--no-sandbox*"
| table _time, ComputerName, User, CommandLine

Wazuh OSSEC Rule

<group name="web,chrome,">
  <rule id="100001" level="12">
    <decoded_as>json</decoded_as>
    <field name="Image">\.*chrome\.exe</field>
    <field name="CommandLine">--no-sandbox</field>
    <description>CVE-2026-106207: Possible Chrome V8 race condition exploitation attempt</description>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations: Disable JavaScript in Chrome for untrusted sites, enforce strict site isolation, and use browser isolation technologies. Educate users on phishing risks and avoid visiting untrusted links. Consider switching to an alternative browser until a patch is available, though verify if other browsers share the V8 engine.
2. Patch/upgrade steps: Monitor Google's official Chrome release channels for version 155.0.8059.39 or later. Once available, apply updates immediately through enterprise management tools. Verify version after update.
3. Long-term hardening: Implement a robust patch management program, use endpoint detection and response (EDR) to monitor for anomalous Chrome behavior, and enable exploit protection features like Microsoft Defender Exploit Guard. Regularly audit browser versions in the environment.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-106207
• Google Chrome Releases: https://chromereleases.googleblog.com/
• CWE-367: https://cwe.mitre.org/data/definitions/367.html
• Chromium Security Severity Guidelines: https://www.chromium.org/developers/severity-guidelines
• CISA KEV: Not applicable (CVE not listed)