CVE-2018-0856

ChakraCore RCE Vulnerability

7.5 HighFix available

Microsoft Edge and ChakraCore in Microsoft Windows 10 1703 and 1709 allows remote code execution, due to how the scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2018-0834, CVE-2018-0835, CVE-2018-0836, CVE-2018-0837, CVE-2018-0838, CVE-2018-0840, CVE-2018-0857, CVE-2018-0858, CVE-2018-0859, CVE-2018-0860, CVE-2018-0861, and CVE-2018-0866.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

15.4%Up 0.6 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2018-0856
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 7.6 HighAV:N/AC:H/Au:N/C:C/I:C/A:C
Weakness: CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-0856
Updated: 2026-11-02

EUVDEUVD-2022-2148 No score

Record: EUVD-2022-2148
Updated: 2026-11-03

GitHub AdvisoriesGHSA-399v-jg88-3gx6 7.5

ChakraCore RCE Vulnerability

Record: GHSA-399v-jg88-3gx6
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

OSVGHSA-399v-jg88-3gx6 7.5

ChakraCore RCE Vulnerability

Record: GHSA-399v-jg88-3gx6
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`Microsoft.ChakraCore` NuGet	before 1.8.1	1.8.1
`Microsoft.ChakraCore` NuGet	before 1.8.1, plus listed versions 1.2.01.2.11.2.21.2.31.2.6.62716-preview Show 23 moreShow less 1.3.01.3.11.3.21.4.01.4.11.4.21.4.31.4.41.4.51.5.01.5.11.5.21.5.31.6.01.6.21.7.01.7.11.7.21.7.31.7.41.7.51.7.61.8.0	1.8.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-0856 is a high vulnerability (CVSS 7.5) in Microsoft Chakracore, published February 15, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 15.4%, the 96th percentile. Fixed in Microsoft.ChakraCore 1.8.1.