CVE-2018-18586

Name: CVE-2018-18586
Creator: NVD / NIST
Published: 2018-10-23T02:29:00.7+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.28%

Last modified Jun 17, 2026

CVE-2018-18586 is a vulnerability of currently unknown severity. 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. EPSS estimates a 3.28% chance of exploitation in the next 30 days.

Description

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

Metrics

EPSS Probability

3.28%

86.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions	Update
Kyzer	Libmspack	0.3	Alpha
Kyzer	Libmspack	0.4	Alpha
Kyzer	Libmspack	0.5	Alpha
Kyzer	Libmspack	0.6	Alpha
Kyzer	Libmspack	0.7	Alpha

References

https://bugs.debian.org/911639Mailing List, Third Party Advisory
https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6dExploit, Vendor Advisory
https://security.gentoo.org/glsa/201903-20Third Party Advisory
https://www.openwall.com/lists/oss-security/2018/10/22/1Mailing List, Third Party Advisory
https://bugs.debian.org/911639Mailing List, Third Party Advisory
https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6dExploit, Vendor Advisory
https://security.gentoo.org/glsa/201903-20Third Party Advisory
https://www.openwall.com/lists/oss-security/2018/10/22/1Mailing List, Third Party Advisory

Timeline

Published: Oct 23, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-18586?

How severe is CVE-2018-18586?

Severity scoring for CVE-2018-18586 is pending analysis. The EPSS model estimates a 3.28% probability of exploitation in the next 30 days.

How do I fix CVE-2018-18586?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-18586?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST