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Vulnerability details: VCID-p3uw-6r5p-mbe8
Vulnerability ID VCID-p3uw-6r5p-mbe8
Aliases CVE-2018-8556
GHSA-fmv2-jv3p-6w47
Summary Out-of-bounds Write 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-2018-8541, CVE-2018-8542, CVE-2018-8543, CVE-2018-8551, CVE-2018-8555, CVE-2018-8557, CVE-2018-8588.
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-787 Out-of-bounds Write
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.179 https://api.first.org/data/v1/epss?cve=CVE-2018-8556
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-fmv2-jv3p-6w47
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/2781608a34eacc32f9262e2304a534648235be6b
generic_textual HIGH https://github.com/chakra-core/ChakraCore/commit/2781608a34eacc32f9262e2304a534648235be6b
cvssv3.1 7.5 https://github.com/chakra-core/ChakraCore/pull/5827
generic_textual HIGH https://github.com/chakra-core/ChakraCore/pull/5827
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-8556
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2018-8556
cvssv3.1 7.5 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8556
generic_textual HIGH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8556
cvssv3.1 7.5 https://web.archive.org/web/20210124213934/http://www.securityfocus.com/bid/105779
generic_textual HIGH https://web.archive.org/web/20210124213934/http://www.securityfocus.com/bid/105779
cvssv3.1 7.5 https://web.archive.org/web/20211126224439/http://www.securitytracker.com/id/1042107
generic_textual HIGH https://web.archive.org/web/20211126224439/http://www.securitytracker.com/id/1042107
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2018-8556
https://github.com/chakra-core/ChakraCore
https://github.com/chakra-core/ChakraCore/commit/2781608a34eacc32f9262e2304a534648235be6b
https://github.com/chakra-core/ChakraCore/pull/5827
https://web.archive.org/web/20210124213934/http://www.securityfocus.com/bid/105779
https://web.archive.org/web/20211126224439/http://www.securitytracker.com/id/1042107
http://www.securityfocus.com/bid/105779
http://www.securitytracker.com/id/1042107
CVE-2018-8556 https://nvd.nist.gov/vuln/detail/CVE-2018-8556
CVE-2018-8556 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8556
GHSA-fmv2-jv3p-6w47 https://github.com/advisories/GHSA-fmv2-jv3p-6w47
No exploits are available.
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

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://github.com/chakra-core/ChakraCore/commit/2781608a34eacc32f9262e2304a534648235be6b
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://github.com/chakra-core/ChakraCore/pull/5827
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-2018-8556
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-2018-8556
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/20210124213934/http://www.securityfocus.com/bid/105779
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/20211126224439/http://www.securitytracker.com/id/1042107
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 0.9526
EPSS Score 0.179
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T20:54:31.220488+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/Microsoft.ChakraCore/CVE-2018-8556.yml 38.6.0