CVE-2018-18586

mediumpriority · track · 22EPSS 0.033 · 88 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

3.28% (88th) EPSS

CVSS 5 · medium

Is it mine?

6 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

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

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.04.9mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USprimary

affected products (6)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
kyzer libmspack= 0.3nvdUScpe:2.3:a:kyzer:libmspack:*:*:*:*:*:*:*:*
kyzer libmspack= 0.4nvdUScpe:2.3:a:kyzer:libmspack:*:*:*:*:*:*:*:*
kyzer libmspack= 0.5nvdUScpe:2.3:a:kyzer:libmspack:*:*:*:*:*:*:*:*
kyzer libmspack= 0.6nvdUScpe:2.3:a:kyzer:libmspack:*:*:*:*:*:*:*:*
kyzer libmspack= 0.7nvdUScpe:2.3:a:kyzer:libmspack:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2018-10-23modified 2026-06-17

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+12533 more

references (15)

External citations — patches, advisories, analysis.

scry

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