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Vulnerability details: VCID-hp26-tbjy-fqdn
Vulnerability ID VCID-hp26-tbjy-fqdn
Aliases CVE-2018-8291
GHSA-j67m-wpv6-pv44
Summary Access of Resource Using Incompatible Type ('Type Confusion') A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers, aka "Scripting Engine Memory Corruption Vulnerability." This affects ChakraCore, Internet Explorer, Microsoft Edge. This CVE ID is unique from CVE-2018-8242, CVE-2018-8283, CVE-2018-8287, CVE-2018-8288, CVE-2018-8296, CVE-2018-8298.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.76284 https://api.first.org/data/v1/epss?cve=CVE-2018-8291
cvssv3.1 7.5 https://github.com/chakra-core/ChakraCore
generic_textual HIGH https://github.com/chakra-core/ChakraCore
cvssv3.1 7.5 https://github.com/chakra-core/ChakraCore/commit/c322694178ece209b0aa73eafd97a036def86eb1
generic_textual HIGH https://github.com/chakra-core/ChakraCore/commit/c322694178ece209b0aa73eafd97a036def86eb1
cvssv3.1 7.5 https://github.com/chakra-core/ChakraCore/pull/5444
generic_textual HIGH https://github.com/chakra-core/ChakraCore/pull/5444
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-8291
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2018-8291
cvssv3.1 7.5 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8291
generic_textual HIGH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8291
cvssv3.1 7.5 https://web.archive.org/web/20210124183732/http://www.securityfocus.com/bid/104637
generic_textual HIGH https://web.archive.org/web/20210124183732/http://www.securityfocus.com/bid/104637
cvssv3.1 7.5 https://web.archive.org/web/20210515050150/http://www.securitytracker.com/id/1041258
generic_textual HIGH https://web.archive.org/web/20210515050150/http://www.securitytracker.com/id/1041258
cvssv3.1 7.5 https://web.archive.org/web/20211202002348/http://www.securitytracker.com/id/1041256
generic_textual HIGH https://web.archive.org/web/20211202002348/http://www.securitytracker.com/id/1041256
cvssv3.1 7.5 https://www.exploit-db.com/exploits/45215
generic_textual HIGH https://www.exploit-db.com/exploits/45215
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2018-8291
https://github.com/chakra-core/ChakraCore
https://github.com/chakra-core/ChakraCore/commit/c322694178ece209b0aa73eafd97a036def86eb1
https://github.com/chakra-core/ChakraCore/pull/5444
https://web.archive.org/web/20210124183732/http://www.securityfocus.com/bid/104637
https://web.archive.org/web/20210515050150/http://www.securitytracker.com/id/1041258
https://web.archive.org/web/20211202002348/http://www.securitytracker.com/id/1041256
https://www.exploit-db.com/exploits/45215
https://www.exploit-db.com/exploits/45215/
http://www.securityfocus.com/bid/104637
http://www.securitytracker.com/id/1041256
http://www.securitytracker.com/id/1041258
CVE-2018-8291 Exploit https://bugs.chromium.org/p/project-zero/issues/detail?id=1576
CVE-2018-8291 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/dos/45215.js
CVE-2018-8291 https://nvd.nist.gov/vuln/detail/CVE-2018-8291
CVE-2018-8291 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8291
Data source Exploit-DB
Date added Aug. 17, 2018
Description Microsoft Edge Chakra JIT - 'DictionaryPropertyDescriptor::CopyFrom' Type Confusion
Ransomware campaign use Known
Source publication date Aug. 17, 2018
Exploit type dos
Platform windows
Source update date Aug. 17, 2018
Source URL https://bugs.chromium.org/p/project-zero/issues/detail?id=1576
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/chakra-core/ChakraCore
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

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high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/chakra-core/ChakraCore/commit/c322694178ece209b0aa73eafd97a036def86eb1
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

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none

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low

none

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none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/chakra-core/ChakraCore/pull/5444
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-8291
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8291
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://web.archive.org/web/20210124183732/http://www.securityfocus.com/bid/104637
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://web.archive.org/web/20210515050150/http://www.securitytracker.com/id/1041258
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://web.archive.org/web/20211202002348/http://www.securitytracker.com/id/1041256
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://www.exploit-db.com/exploits/45215
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.98949
EPSS Score 0.76284
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:38:00.328281+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/Microsoft.ChakraCore/CVE-2018-8291.yml 38.6.0