Directory Traversal Affecting libmspack package, versions <0.8-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-LIBMSPACK-21173040
- published17 Oct 2026
- disclosed23 Oct 2018
Introduced: 23 Oct 2018
CVE-2018-18586 (opens in a new tab)How to fix?
Upgrade Echo:latest libmspack to version 0.8-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libmspack package and not the libmspack package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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