CVE-2018-8466

ChakraCore RCE Vulnerability

7.5 HighPublic exploitFix available

A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-8367, CVE-2018-8465, CVE-2018-8467.

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

69.0%Up 19.6 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2018-8466
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-2018-8466
Updated: 2026-11-02

EUVDEUVD-2022-2356 No score

Record: EUVD-2022-2356
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4c93-q79v-mw45 7.5

ChakraCore RCE Vulnerability

Record: GHSA-4c93-q79v-mw45
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

OSV 7.5

Record: CVE-2018-8466
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-4c93-q79v-mw45 7.5

ChakraCore RCE Vulnerability

Record: GHSA-4c93-q79v-mw45
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 1.11.1	1.11.1
`Microsoft.ChakraCore` NuGet	before 1.11.1, plus listed versions 1.10.01.10.11.10.21.11.01.2.0 Show 32 moreShow less 1.2.11.2.21.2.31.2.6.62716-preview1.3.01.3.11.3.21.4.01.4.11.4.21.4.31.4.41.4.51.5.01.5.11.5.21.5.31.6.01.6.21.7.01.7.11.7.21.7.31.7.41.7.51.7.61.8.01.8.11.8.21.8.31.8.41.8.5	1.11.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	Microsoft Edge Chakra JIT - 'BailOutOnInvalidatedArrayHeadSegment' Check Bypass	2018-10-09

History

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

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

In short

CVE-2018-8466 is a high vulnerability (CVSS 7.5) in Microsoft Chakracore, published September 13, 2018. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 69.0%, the 99th percentile. Fixed in Microsoft.ChakraCore 1.11.1.

References

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