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
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libmspack | 0.8-1 | — |
| Debian 13 | libmspack | 0.8-1 | — |
| Debian 12 | libmspack | 0.8-1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | libmspack | 0.6-3.14.1 | SUSE-SU-2022:0069-1 |
| SLES 12 SP5 | libmspack | 0.4-15.13.1 | SUSE-SU-2022:4287-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | libmspack | 0.4-15.13.1 | SUSE-SU-2022:4287-1 |
| SLE Real Time 15 SP2 | libmspack | 0.6-3.14.1 | SUSE-SU-2022:0069-2 |
| SLE Micro 5.1 | libmspack | 0.6-3.14.1 | SUSE-SU-2022:0069-1 |
| SLE Micro 5.0 | libmspack | 0.6-3.14.1 | SUSE-SU-2022:0069-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | libmspack | 0.6-3.14.1 | openSUSE-SU-2022:0069-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.23 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.22 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.21 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.20 | libmspack | 0.8_alpha-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.18 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.17 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.16 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.15 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.14 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.13 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.12 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.11 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.10 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.9 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.8 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.7 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.6 | libmspack | 0.8_alpha-r0 | — |
Advisories 4
- SUSE-SU-2022:4287-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0069-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0069-2 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0069-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026