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Vulnerability details: VCID-41ed-s35k-8uaa
Vulnerability ID VCID-41ed-s35k-8uaa
Aliases CVE-2018-0856
GHSA-399v-jg88-3gx6
Summary Out-of-bounds Write Microsoft Edge and ChakraCore in Microsoft Windows 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.
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 0.284 https://api.first.org/data/v1/epss?cve=CVE-2018-0856
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-399v-jg88-3gx6
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/385af842bce4f94ddef98553a81f8ea99c7e2dcf
generic_textual HIGH https://github.com/chakra-core/ChakraCore/commit/385af842bce4f94ddef98553a81f8ea99c7e2dcf
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-0856
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2018-0856
cvssv3.1 7.5 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0856
generic_textual HIGH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0856
cvssv3.1 7.5 https://web.archive.org/web/20210125205300/http://www.securityfocus.com/bid/102880
generic_textual HIGH https://web.archive.org/web/20210125205300/http://www.securityfocus.com/bid/102880
cvssv3.1 7.5 https://web.archive.org/web/20211208072939/http://www.securitytracker.com/id/1040372
generic_textual HIGH https://web.archive.org/web/20211208072939/http://www.securitytracker.com/id/1040372
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2018-0856
https://github.com/chakra-core/ChakraCore
https://github.com/chakra-core/ChakraCore/commit/385af842bce4f94ddef98553a81f8ea99c7e2dcf
https://web.archive.org/web/20210125205300/http://www.securityfocus.com/bid/102880
https://web.archive.org/web/20211208072939/http://www.securitytracker.com/id/1040372
http://www.securityfocus.com/bid/102880
http://www.securitytracker.com/id/1040372
CVE-2018-0856 https://nvd.nist.gov/vuln/detail/CVE-2018-0856
CVE-2018-0856 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0856
GHSA-399v-jg88-3gx6 https://github.com/advisories/GHSA-399v-jg88-3gx6
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/385af842bce4f94ddef98553a81f8ea99c7e2dcf
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-2018-0856
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-2018-0856
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/20210125205300/http://www.securityfocus.com/bid/102880
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/20211208072939/http://www.securitytracker.com/id/1040372
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 0.96593
EPSS Score 0.284
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T20:53:25.877564+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/Microsoft.ChakraCore/CVE-2018-0856.yml 38.6.0