Detect CVE-2026-3910: Google Chromium V8 Memory Buffer Bounds Violation in Elastic Security
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
Elastic Detection Query
sequence by host.name with maxspan=2m
[process where event.type == "start"
and process.parent.name in ("chrome.exe", "msedge.exe")
and process.name in ("cmd.exe", "powershell.exe", "wscript.exe", "cscript.exe", "mshta.exe", "rundll32.exe", "regsvr32.exe", "certutil.exe", "bitsadmin.exe", "wmic.exe")]
[any where event.category in ("network", "file") and
(process.name in ("cmd.exe", "powershell.exe") or
network.direction == "egress" and not cidr_match(destination.ip, "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"))]EQL sequence rule detecting a Chrome/Edge suspicious child process spawn followed within 2 minutes by network egress or file activity from that child process, indicating successful V8 exploit leading to post-exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Browser-based automation or RPA (Robotic Process Automation) tools that launch shell commands as part of workflows
- Developer toolchains that invoke browser processes and subsequently run build scripts
- Enterprise endpoint management software that uses browser process injection for legitimate purposes
- Security scanning tools that simulate browser behavior and generate network traffic
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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