libmspack: Directory traversal in chmextract.c
Published Oct 23, 2018
5.3
MEDIUMCVSS 3.0
EPSS 3.28%
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
Affected products
No data.
No data.
Red Hat Enterprise Linux 7
libmspack
Not affected
Red Hat Enterprise Linux 8
libmspack
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | libmspack | Not affected | n/a |
| Red Hat Enterprise Linux 8 | libmspack | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of libmspack as shipped with Red Hat Enterprise Linux 7.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.28% (0.03284) | 88.05th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.28% (0.03284) | 86.81th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.18% (0.00182) | 55.93th | v3 (v2023.03.01) |
| Jun 11, 2024 | 0.18% (0.00182) | 55.53th | v3 (v2023.03.01) |
| Oct 16, 2023 | 0.20% (0.00200) | 57.53th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.19% (0.00188) | 55.18th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.14% (0.00138) | 47.43th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.04% (0.01040) | 28.32th | v1 |
| Jan 6, 2022 | 1.04% (0.01040) | 27.69th | v1 |
| Sep 1, 2021 | 1.04% (0.01040) | 64.49th | v1 |
| Apr 14, 2021 | 1.04% (0.01040) | 0.00th | v1 |
References (8)
- https://access.redhat.com/security/cve/CVE-2018-18586 Vendor Advisory
- https://bugs.debian.org/911639 x_refsource_MISCMailing ListThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1644216 Issue Tracking
- https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d x_refsource_MISCExploitVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-18586
- https://security.gentoo.org/glsa/201903-20 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-18586
- https://www.openwall.com/lists/oss-security/2018/10/22/1 x_refsource_MISCMailing ListThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2018-18586 | Vendor Advisory | |
| https://bugs.debian.org/911639 | x_refsource_MISCMailing ListThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1644216 | Issue Tracking | |
| https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d | x_refsource_MISCExploitVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-18586 | ||
| https://security.gentoo.org/glsa/201903-20 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-18586 | ||
| https://www.openwall.com/lists/oss-security/2018/10/22/1 | x_refsource_MISCMailing ListThird Party Advisory |
Change history (0)
No recorded changes yet.