Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2018-18586

20
FAUCET Score

CVE-2018-18586 describes a Directory Traversal vulnerability in the chmextract sample program, distributed with libmspack before version 0.8alpha, due to a lack of protection against absolute/relative pathnames in CHM files. This medium-severity vulnerability (CVSS 5.3) has a network attack vector and low attack complexity, potentially leading to information disclosure (C:L). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion, and the vendor disputes it as a libmspack vulnerability, considering chmextract.c an example.

Impacted Technologies

VendorProductVersion(s)CPE
0.3CPE matchmatch criteria
cpe:2.3:a:kyzer:libmspack:0.3:alpha:*:*:*:*:*:*
0.4CPE matchmatch criteria
cpe:2.3:a:kyzer:libmspack:0.4:alpha:*:*:*:*:*:*
0.5CPE matchmatch criteria
cpe:2.3:a:kyzer:libmspack:0.5:alpha:*:*:*:*:*:*
0.6CPE matchmatch criteria
cpe:2.3:a:kyzer:libmspack:0.6:alpha:*:*:*:*:*:*
0.7CPE matchmatch criteria
cpe:2.3:a:kyzer:libmspack:0.7:alpha:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.28%
Probability of exploitation in next 30 days
EPSS Percentile
87.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0328 is in the 82nd percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2018-18586Moderate

libmspack: Directory traversal in chmextract.c

Oct 17, 2018

References

bugs.debian.org / 911639
Mailing ListThird Party Advisory
github.com / kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d
ExploitVendor Advisory
security.gentoo.org / glsa/201903-20
Third Party Advisory
openwall.com / lists/oss-security/2018/10/22/1
Mailing ListThird Party Advisory