Description
In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Quantum block, leading to an out-of-bounds write.
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 | cabextract | 1.4-5 | — |
| Debian 14 | libmspack | 0.8-1 | — |
| Debian 13 | cabextract | 1.4-5 | — |
| Debian 13 | libmspack | 0.8-1 | — |
| Debian 12 | cabextract | 1.4-5 | — |
| Debian 12 | libmspack | 0.8-1 | — |
| Debian 8 | libmspack | 0.5-1+deb8u3 | DLA-1555-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libmspack | 0.6-3ubuntu0.2 | USN-3814-1 |
| Ubuntu 16.04 LTS | libmspack | 0.5-1ubuntu0.16.04.3 | USN-3814-1 |
| Ubuntu 14.04 LTS | clamav | 0.100.2+dfsg-1ubuntu0.14.04.2 | USN-3814-2 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | cabextract | 1.4-4ubuntu0.1~esm1 | — |
| Ubuntu Pro 14.04 LTS | libmspack | 0.4-1ubuntu0.1~esm1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | libmspack +1 | 0.5-0.7.alpha.el7 | RHSA-2019:2049 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | libmspack | 0.6-3.3.11 | SUSE-SU-2019:0748-1 |
| SLES 12 SP5 | libmspack | 0.4-15.7.1 | SUSE-SU-2020:2711-1 |
| SLES 11 SP4 | libmspack | 0.0.20060920alpha-74.11.6.1 | SUSE-SU-2019:13992-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | libmspack | 0.4-15.7.1 | SUSE-SU-2020:2711-1 |
| SLES for SAP 11 SP4 | libmspack | 0.0.20060920alpha-74.11.6.1 | SUSE-SU-2019:13992-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | cabextract | 1.8-r0 | — |
| Alpine v3.24 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.23 | cabextract | 1.8-r0 | — |
| Alpine v3.23 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.22 | cabextract | 1.8-r0 | — |
| Alpine v3.22 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.21 | cabextract | 1.8-r0 | — |
| Alpine v3.21 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.20 | cabextract | 1.8-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 | cabextract | 1.8-r0 | — |
| Alpine v3.19 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.18 | cabextract | 1.8-r0 | — |
| Alpine v3.18 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.17 | cabextract | 1.8-r0 | — |
| Alpine v3.17 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.16 | cabextract | 1.8-r0 | — |
| Alpine v3.16 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.15 | cabextract | 1.8-r0 | — |
| Alpine v3.15 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.14 | cabextract | 1.8-r0 | — |
| Alpine v3.14 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.13 | cabextract | 1.8-r0 | — |
| Alpine v3.13 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.12 | cabextract | 1.8-r0 | — |
| Alpine v3.12 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.11 | cabextract | 1.8-r0 | — |
| Alpine v3.11 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.10 | cabextract | 1.8-r0 | — |
| Alpine v3.10 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.9 | cabextract | 1.8-r0 | — |
| Alpine v3.9 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.8 | cabextract | 1.8-r0 | — |
| Alpine v3.8 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.7 | cabextract | 1.8-r0 | — |
| Alpine v3.7 | libmspack | 0.8_alpha-r0 | — |
| Alpine v3.6 | cabextract | 1.8-r0 | — |
| Alpine v3.6 | libmspack | 0.8_alpha-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libmspack +1 | 0.5-0.7.alpha.amzn2 | ALAS2-2019-1310 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | libmspack +1 | 0.5-0.7.alpha.el7 | ELSA-2019-2049 |
Advisories 10
- WID-SEC-2022-0517 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- RHSA-2019:2049 Red Hat Security Advisory: libmspack security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3814-2 clamav vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3814-1 libmspack vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1555-1 libmspack - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:13992-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0748-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2711-1 Security update for libmspack SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2019-1310 Moderate: libmspack security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 9, 2019
- ELSA-2019-2049 Moderate: libmspack security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 13, 2019
References
- https://bugs.debian.org/911640
- https://www.cabextract.org.uk/#changes
- USN-3814-3 vendor-advisory
- USN-3814-1 vendor-advisory
- USN-3814-2 vendor-advisory
- https://www.openwall.com/lists/oss-security/2018/10/22/1
- [debian-lts-announce] 20181026 [SECURITY] [DLA 1555-1] libmspack security update mailing-list
- https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2
- GLSA-201903-20 vendor-advisory
- RHSA-2019:2049 vendor-advisory
- https://www.starwindsoftware.com/security/sw-20181213-0001/