Detect CVE-2026-3910: Google Chromium V8 Memory Buffer Bounds Violation in Google Chronicle
Detects exploitation attempts and post-exploitation indicators related to CVE-2026-3910, an improper restriction of operations within the bounds of a memory buffer (CWE-119) in Google Chromium's V8 JavaScript engine. This vulnerability is actively exploited in the wild (CISA KEV) and may allow attackers to achieve remote code execution via a malicious web page, potentially leading to sandbox escape and full system compromise.
MITRE ATT&CK
YARA-L Detection Query
rule cve_2026_3910_chromium_v8_exploit {
meta:
author = "df00tech Detection Engineering"
description = "Detects exploitation of CVE-2026-3910 Chromium V8 memory buffer vulnerability via suspicious browser child process spawning"
severity = "CRITICAL"
priority = "HIGH"
reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-3910"
events:
$proc.metadata.event_type = "PROCESS_LAUNCH"
$proc.principal.process.file.full_path = /(?i)(chrome\.exe|msedge\.exe)$/
$proc.target.process.file.full_path = /(?i)(cmd\.exe|powershell\.exe|wscript\.exe|cscript\.exe|mshta\.exe|rundll32\.exe|regsvr32\.exe|certutil\.exe|bitsadmin\.exe|wmic\.exe)$/
$proc.principal.hostname = $hostname
match:
$hostname over 5m
condition:
$proc
}Chronicle YARA-L rule detecting Chromium V8 exploitation patterns by monitoring for suspicious child process spawning from Chrome or Edge browser processes, a common indicator of successful memory corruption exploit execution.
Data Sources
Required Tables
False Positives & Tuning
- Automated browser testing frameworks operating in development environments where Chrome spawns shell processes
- Enterprise software suites that embed Chromium and legitimately invoke command interpreters
- Browser extensions with native messaging hosts that spawn system processes
- IT automation tools that use Chrome DevTools Protocol and may spawn helper processes
Other platforms for CVE-2026-3910
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Simulate Chrome Spawning PowerShell Child Process
Expected signal: Sysmon EventID 1 showing powershell.exe with ParentImage chrome.exe; DeviceProcessEvents alert in MDE; CrowdStrike ProcessRollup2 with ParentBaseFileName=chrome.exe and FileName=powershell.exe
- Test 2Simulate Chrome Spawning certutil for Payload Download
Expected signal: Sysmon EventID 1 with ParentImage chrome.exe and Image certutil.exe; network connection attempt to 127.0.0.1:8080; file creation event in C:\Windows\Temp\
- Test 3Simulate Chrome Crash with Access Violation Exception
Expected signal: Windows Application EventLog EventID 1000 with Faulting application name matching the test process; exception code 0xC0000005 (STATUS_ACCESS_VIOLATION) visible in event data
- Test 4Simulate Anomalous Outbound Connection from Chrome Process
Expected signal: Network flow log showing outbound TCP SYN to 203.0.113.1:4444 (TEST-NET-3, RFC 5737 — safe for testing); process name visible in socket tracking if using eBPF-based EDR
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