CVE-2016-3386

HIGH

Microsoft Edge - Remote Code Execution via Chakra JavaScript Engine Memory Corruption

Title source: llm

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-3386. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit leverages a race condition in Chakra's JavaScript engine where the spread operator mishandles array length checks during prototype manipulation, leading to a buffer overflow. The PoC uses a Proxy to modify the array length during iteration, bypassing the initial bounds check.

Description

The Chakra JavaScript engine in Microsoft Edge allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Scripting Engine Memory Corruption Vulnerability," a different vulnerability than CVE-2016-3389, CVE-2016-7190, and CVE-2016-7194.

Exploits (1)

exploitdb WORKING POC VERIFIED

by Google Security Research · htmldoswindows

https://www.exploit-db.com/exploits/40605

View Code ZIP pw:eip

This exploit leverages a race condition in Chakra's JavaScript engine where the spread operator mishandles array length checks during prototype manipulation, leading to a buffer overflow. The PoC uses a Proxy to modify the array length during iteration, bypassing the initial bounds check.

Classification

Working Poc 95%

Attack Type

Rce

Complexity

Moderate

Reliability

Racy

Target: Microsoft ChakraCore (Edge/IE JavaScript engine)

No auth needed

Prerequisites: Target must execute the malicious JavaScript in a vulnerable ChakraCore environment

MITRE ATT&CK

T1068 - Exploitation for Privilege Escalation T1203 - Exploitation for Client Execution

devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3

Core References

Vendor Advisory vendor-advisory x_refsource_ms

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-119

Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack

http://www.securitytracker.com/id/1036993

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/93426

Scores

CVSS v3 7.5

EPSS 0.7587

EPSS Percentile 98.9%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE

CWE-119

Status published

Products (2)

microsoft/edge

nuget/Microsoft.ChakraCore 0 - 1.2.1NuGet

Published Oct 14, 2016

Tracked Since Feb 18, 2026