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Vulnerability details: VCID-ssz6-tx89-s7gn
Vulnerability ID VCID-ssz6-tx89-s7gn
Aliases CVE-2018-18586
Summary chmextract.c in the chmextract sample program, as distributed with libmspack before 0.8alpha, does not protect against absolute/relative pathnames in CHM files, leading to Directory Traversal. NOTE: the vendor disputes that this is a libmspack vulnerability, because chmextract.c was only intended as a source-code example, not a supported application
Status Disputed
Exploitability 0.5
Weighted Severity 4.8
Risk 2.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-18586.json
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00404 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2018-18586
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2018-18586
cvssv3 5.3 https://nvd.nist.gov/vuln/detail/CVE-2018-18586
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-18586.json
https://api.first.org/data/v1/epss?cve=CVE-2018-18586
https://bugs.debian.org/911639
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18586
https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d
https://security.gentoo.org/glsa/201903-20
https://www.openwall.com/lists/oss-security/2018/10/22/1
1644216 https://bugzilla.redhat.com/show_bug.cgi?id=1644216
911639 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911639
cpe:2.3:a:kyzer:libmspack:0.3:alpha:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:kyzer:libmspack:0.3:alpha:*:*:*:*:*:*
cpe:2.3:a:kyzer:libmspack:0.4:alpha:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:kyzer:libmspack:0.4:alpha:*:*:*:*:*:*
cpe:2.3:a:kyzer:libmspack:0.5:alpha:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:kyzer:libmspack:0.5:alpha:*:*:*:*:*:*
cpe:2.3:a:kyzer:libmspack:0.6:alpha:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:kyzer:libmspack:0.6:alpha:*:*:*:*:*:*
cpe:2.3:a:kyzer:libmspack:0.7:alpha:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:kyzer:libmspack:0.7:alpha:*:*:*:*:*:*
CVE-2018-18586 https://nvd.nist.gov/vuln/detail/CVE-2018-18586
No exploits are available.
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-18586.json
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: AV:N/AC:L/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-18586
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-18586
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 0.60148
EPSS Score 0.00404
Published At Aug. 8, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T13:50:54.093281+00:00 NVD CVE Status Improver Improve https://cveawg.mitre.org/api/cve/CVE-2018-18586 37.0.0
2025-07-31T08:28:34.149696+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.22/community.json 37.0.0