Description
An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. There is an off-by-one error in the CHM PMGI/PMGL chunk number validity checks, which could lead to denial of service (uninitialized data dereference and application crash).
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 | 0.7-1 | — |
| Debian 13 | libmspack | 0.7-1 | — |
| Debian 12 | libmspack | 0.7-1 | — |
| Debian 9 | libmspack | 0.5-1+deb9u2 | DSA-4260-1 |
| Debian 8 | libmspack | 0.5-1+deb8u2 | DLA-1460-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libmspack | 0.6-3ubuntu0.1 | USN-3728-1 |
| Ubuntu 16.04 LTS | libmspack | 0.5-1ubuntu0.16.04.2 | USN-3728-1 |
| Ubuntu 14.04 LTS | clamav | 0.100.1+dfsg-1ubuntu0.14.04.3 | USN-3728-2 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | libmspack | 0.4-1ubuntu0.1~esm2 | USN-7788-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | libmspack +1 | 0.5-0.6.alpha.el7 | RHSA-2018:3327 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | clamav | 1.4.2-150600.18.6.1 | SUSE-SU-2025:0327-1 |
| SLES 15 SP5 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLES 15 SP4 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLES 15 SP3 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLES 15 SP3 | libmspack | 0.6-3.11.1 | SUSE-SU-2021:2802-1 |
| SLES 15 SP2 | libmspack | 0.6-3.11.1 | SUSE-SU-2021:2802-1 |
Show 32 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | clamav | 0.103.4-3.12.1 | SUSE-SU-2025:0328-1, SUSE-SU-2021:3853-1 |
| SLES 12 SP4 | clamav | 0.103.4-33.41.1 | SUSE-SU-2021:3859-1 |
| SLES 12 SP3 | clamav | 0.100.1-33.15.2 | SUSE-SU-2021:3859-1, SUSE-SU-2018:2323-1 |
| SLES 12 SP2 | clamav | 0.100.1-33.15.2 | SUSE-SU-2021:3859-1, SUSE-SU-2018:2323-2, SUSE-SU-2018:2323-1 |
| SLES 12 SP1 | clamav | 0.100.1-33.15.2 | SUSE-SU-2018:2323-1 |
| SLES 12 | clamav | 0.100.1-33.15.2 | SUSE-SU-2018:2323-1 |
| SLES 11 SP4 | clamav | 0.103.4-0.20.41.1 | SUSE-SU-2021:14850-1 |
| SLES 11 | clamav-openssl1 | 0.103.4-0.20.41.1 | SUSE-SU-2021:14850-1 |
| SLES for SAP 15 SP5 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLES for SAP 15 SP4 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLES for SAP 15 SP3 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLES for SAP 12 SP5 | clamav | 0.103.4-3.12.1 | SUSE-SU-2021:3853-1 |
| SLES for SAP 12 SP4 | clamav | 0.103.4-33.41.1 | SUSE-SU-2021:3859-1 |
| SLES for SAP 12 SP3 | clamav | 0.100.1-33.15.2 | SUSE-SU-2021:3859-1, SUSE-SU-2018:2323-1 |
| SLES for SAP 12 SP2 | clamav | 0.100.1-33.15.2 | SUSE-SU-2018:2323-1 |
| SLES for SAP 12 SP1 | clamav | 0.100.1-33.15.2 | SUSE-SU-2018:2323-1 |
| SLE Micro 5.5 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLE Micro 5.0 | libmspack | 0.6-3.11.1 | SUSE-SU-2021:2802-1 |
| SLE HPC 15 SP5 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLE HPC 15 SP4 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SLE HPC 15 SP3 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SUSE OpenStack Cloud Crowbar 9 | clamav | 0.103.4-33.41.1 | SUSE-SU-2021:3859-1 |
| SUSE OpenStack Cloud Crowbar 8 | clamav | 0.103.4-33.41.1 | SUSE-SU-2021:3859-1 |
| SUSE OpenStack Cloud 9 | clamav | 0.103.4-33.41.1 | SUSE-SU-2021:3859-1 |
| SUSE OpenStack Cloud 8 | clamav | 0.103.4-33.41.1 | SUSE-SU-2021:3859-1 |
| SUSE OpenStack Cloud 7 | clamav | 0.100.1-33.15.2 | SUSE-SU-2018:2323-1 |
| SUSE Manager Server 4.3 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SUSE Manager Proxy 4.3 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | clamav | 0.103.4-0.20.41.1 | SUSE-SU-2021:14850-1 |
| SUSE HPE Helion OpenStack 8 | clamav | 0.103.4-33.41.1 | SUSE-SU-2021:3859-1 |
| SUSE Enterprise Storage 7.1 | clamav | 1.4.2-150200.8.3.1 | SUSE-SU-2025:0325-1 |
| SUSE Enterprise Storage 4 | clamav | 0.100.1-33.15.2 | SUSE-SU-2018:2323-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | clamav | 1.4.2-1.1 | openSUSE-SU-2025:14683-1 |
| openSUSE Leap 15.6 | clamav | 1.4.2-150600.18.6.1 | SUSE-SU-2025:0327-1 |
| openSUSE Leap 15.3 | libmspack | 0.6-3.11.1 | openSUSE-SU-2021:2802-1 |
| openSUSE Leap 15.2 | libmspack | 0.6-lp152.6.3.1 | openSUSE-SU-2021:1200-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.23 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.22 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.21 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.20 | libmspack | 0.7.1_alpha-r0 | — |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.18 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.17 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.16 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.15 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.14 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.13 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.12 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.11 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.10 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.9 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.8 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.7 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.6 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.5 | libmspack | 0.7.1_alpha-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libmspack +1 | 0.5-0.6.alpha.amzn2.0.1 | ALAS2-2019-1152 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | libmspack +1 | 0.5-0.6.alpha.el7 | ELSA-2018-3327 |
Advisories 21
- RHSA-2018:3327 Red Hat Security Advisory: libmspack security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-7788-1 libmspack vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3728-1 libmspack vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3728-2 clamav vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4260-1 libmspack - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1460-1 libmspack - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:3859-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3853-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1200-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2323-2 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2802-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0325-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2323-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14683-1 clamav-1.4.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2802-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0328-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14850-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0327-1 Security update for clamav SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2025-0249 ClamAV: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 3, 2025
- ALAS2-2019-1152 Low: libmspack security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 25, 2019
- ELSA-2018-3327 Low: libmspack security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 5, 2018
References
- USN-3728-3 vendor-advisory
- DSA-4260 vendor-advisory
- [debian-lts-announce] 20180806 [SECURITY] [DLA-1460-1] libmspack security update mailing-list
- https://github.com/kyz/libmspack/commit/72e70a921f0f07fee748aec2274b30784e1d312a
- https://bugs.debian.org/904802
- http://www.openwall.com/lists/oss-security/2018/07/26/1
- RHSA-2018:3505 vendor-advisory
- USN-3789-2 vendor-advisory
- USN-3728-2 vendor-advisory
- 1041410 vdb-entry
- USN-3728-1 vendor-advisory
- RHSA-2018:3327 vendor-advisory
- GLSA-201903-20 vendor-advisory