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Vulnerability record · CVE-2018-18584 · published 23 October 2018

CVE-2018-18584: Cabextract project cabextract out-of-bounds write vulnerability

CCabextract Project · Cabextract

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.

6.5 CVSS 3.1 Medium EPSS 3.1% · top 12.8% CWE-787 · Out-of-bounds write
6.5CVSS 3.1 base score, v2 4.3
3.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

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/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2019:2049 Third Party Advisory
https://bugs.debian.org/911640 Mailing ListThird Party Advisory
https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/10/msg00017.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201903-20 Third 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/#changes ProductVendor Advisory
https://www.openwall.com/lists/oss-security/2018/10/22/1 Mailing ListThird Party Advisory
https://www.starwindsoftware.com/security/sw-20181213-0001/ Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2049 Third Party Advisory
https://bugs.debian.org/911640 Mailing ListThird Party Advisory
https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/10/msg00017.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201903-20 Third 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/#changes ProductVendor Advisory
https://www.openwall.com/lists/oss-security/2018/10/22/1 Mailing ListThird Party Advisory
https://www.starwindsoftware.com/security/sw-20181213-0001/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-18584), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.