CVE-2018-18584
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.
Does this matter?
Lower severity and a low EPSS score (2.66%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- EPSS
- 2.66% probability · 86th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- cabextract project/cabextract · libmspack project/libmspack · debian/debian linux · redhat/enterprise linux · canonical/ubuntu linux · suse/linux enterprise server · starwindsoftware/starwind virtual san
- Source
- cve@mitre.org
EPSS 2.7% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://access.redhat.com/errata/RHSA-2019:2049Third Party Advisory
- https://bugs.debian.org/911640Mailing List, Third Party Advisory
- https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/10/msg00017.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201903-20Third Party Advisory
- https://usn.ubuntu.com/3814-1/Third Party Advisory
- https://usn.ubuntu.com/3814-2/Third Party Advisory
- https://usn.ubuntu.com/3814-3/Third Party Advisory
- https://www.cabextract.org.uk/#changesProduct, Vendor Advisory
- https://www.openwall.com/lists/oss-security/2018/10/22/1Mailing List, Third Party Advisory
- https://www.starwindsoftware.com/security/sw-20181213-0001/Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2049Third Party Advisory
- https://bugs.debian.org/911640Mailing List, Third Party Advisory
- https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/10/msg00017.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201903-20Third Party Advisory
- https://usn.ubuntu.com/3814-1/Third Party Advisory
- https://usn.ubuntu.com/3814-2/Third Party Advisory
- https://usn.ubuntu.com/3814-3/Third Party Advisory
- https://www.cabextract.org.uk/#changesProduct, Vendor Advisory
- https://www.openwall.com/lists/oss-security/2018/10/22/1Mailing List, Third Party Advisory
- https://www.starwindsoftware.com/security/sw-20181213-0001/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.