Detect CVE-2026-3910: Google Chromium V8 Memory Buffer Bounds Violation in CrowdStrike LogScale
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
LogScale Detection Query
event_simpleName=ProcessRollup2
| search ParentBaseFileName IN (chrome.exe, msedge.exe)
| search FileName IN (cmd.exe, powershell.exe, wscript.exe, cscript.exe, mshta.exe, rundll32.exe, regsvr32.exe, certutil.exe, bitsadmin.exe, wmic.exe)
| eval risk_score=case(
FileName=="powershell.exe" AND match(CommandLine, "-enc|-EncodedCommand|-nop|-WindowStyle Hidden"), 100,
FileName=="certutil.exe" AND match(CommandLine, "-urlcache|-decode"), 95,
FileName=="mshta.exe", 90,
FileName=="cmd.exe" AND match(CommandLine, "http|ftp|bitsadmin"), 85,
true(), 70
)
| where risk_score >= 70
| table timestamp, ComputerName, UserName, ParentBaseFileName, ParentCommandLine, FileName, CommandLine, risk_score
| sort -risk_scoreCrowdStrike Falcon CQL query identifying suspicious child process spawning from Chromium-based browsers with risk scoring based on command-line indicators commonly associated with post-exploitation activity following V8 memory corruption.
Data Sources
Required Tables
False Positives & Tuning
- Selenium or Playwright automation frameworks that spawn cmd.exe or PowerShell as part of browser-driven test scripts
- Enterprise endpoint management platforms that use Chrome as a conduit for deployment scripts
- Developer workstations where Chromium-based IDEs or tools spawn shell processes for build tasks
- Penetration testing engagements where security teams exercise browser exploitation scenarios in authorized environments
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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