Medium
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-18584
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:01 UTC · Revision 1
Source evidence
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.
osv:CVE-2018-18584
Complete source record
{
"id": "b7e4a73aa58f6bac8c0ed675acdb84da5d9b2463095238417073bc4225e174b6",
"url": "https://osv.dev/vulnerability/CVE-2018-18584",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-18584",
"summary": "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.",
"evidence": "osv:CVE-2018-18584",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2018-18584",
"aliases": [
"CVE-2018-18584"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/kyz/libmspack",
"type": "GIT",
"events": [
{
"introduced": "a22627dd5180e0ce9c558d0c10b174c760085f57"
},
{
"last_affected": "846db1c3419eca65f8d09b5452063870a65ed9f0"
},
{
"fixed": "40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:libmspack_project:libmspack:0.3:alpha:*:*:*:*:*:*",
"range": [
{
"introduced": "0.3-alpha"
},
{
"last_affected": "0.3-alpha"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:libmspack_project:libmspack:0.4:alpha:*:*:*:*:*:*",
"range": [
{
"introduced": "0.4-alpha"
},
{
"last_affected": "0.4-alpha"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:libmspack_project:libmspack:0.5:alpha:*:*:*:*:*:*",
"range": [
{
"introduced": "0.5-alpha"
},
{
"last_affected": "0.5-alpha"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:libmspack_project:libmspack:0.6:alpha:*:*:*:*:*:*",
"range": [
{
"introduced": "0.6-alpha"
},
{
"last_affected": "0.6-alpha"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:libmspack_project:libmspack:0.7:alpha:*:*:*:*:*:*",
"range": [
{
"introduced": "0.7-alpha"
},
{
"last_affected": "0.7-alpha"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:libmspack_project:libmspack:0.7.1:alpha:*:*:*:*:*:*",
"range": [
{
"introduced": "0.7.1-alpha"
},
{
"last_affected": "0.7.1-alpha"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"0.3-alpha",
"0.4-alpha",
"0.5-alpha",
"0.6-alpha",
"0.7-alpha",
"0.7.1-alpha",
"v0.7.1alpha",
"1.7",
"v0.7alpha",
"v0.6alpha",
"v1.5",
"v0.5alpha",
"v0.4alpha",
"v1.4",
"v0.3alpha"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-18584.json",
"vanir_signatures": [
{
"id": "CVE-2018-18584-3cecbcbb",
"digest": {
"threshold": 0.9,
"line_hashes": [
"158240116603677036819695488739621403627",
"269271669553547603752875556704960232567",
"37544086892789893982291370903966203759",
"169871899111443360361982281484202037437",
"257408676381020978427987901723890493853",
"293194494984887529254768129453583513323",
"143245517895524289051156808528142211988",
"161511177930475588070979568568117240902"
]
},
"source": "https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2",
"target": {
"file": "libmspack/mspack/cab.h"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-24T14:03:30Z"
}
}
],
"modified": "2026-10-24T14:03:30.679459521Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2019:2049",
"https://bugs.debian.org/911640",
"https://lists.debian.org/debian-lts-announce/2018/10/msg00017.html",
"https://security.gentoo.org/glsa/201903-20",
"https://usn.ubuntu.com/3814-1/",
"https://usn.ubuntu.com/3814-2/",
"https://usn.ubuntu.com/3814-3/",
"https://www.cabextract.org.uk/#changes",
"https://www.openwall.com/lists/oss-security/2018/10/22/1",
"https://www.starwindsoftware.com/security/sw-20181213-0001/",
"https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:cabextract_project:cabextract:*:*:*:*:*:*:*:*"
],
"vendor_product": "cabextract_project:cabextract",
"extracted_events": [
{
"range": [
{
"fixed": "1.8"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "12.04"
},
{
"last_affected": "12.04"
},
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "18.10"
},
{
"last_affected": "18.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:suse:linux_enterprise_server:11:sp3:*:*:ltss:*:*:*",
"cpe:2.3:o:suse:linux_enterprise_server:12:ga:*:*:ltss:*:*:*",
"cpe:2.3:o:suse:linux_enterprise_server:12:sp1:*:*:ltss:*:*:*",
"cpe:2.3:o:suse:linux_enterprise_server:12:sp2:*:*:ltss:*:*:*"
],
"vendor_product": "suse:linux_enterprise_server",
"extracted_events": [
{
"range": [
{
"introduced": "11-sp3"
},
{
"last_affected": "11-sp3"
},
{
"introduced": "12-ga"
},
{
"last_affected": "12-ga"
},
{
"introduced": "12-sp1"
},
{
"last_affected": "12-sp1"
},
{
"introduced": "12-sp2"
},
{
"last_affected": "12-sp2"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-18584",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442813,
"published_at": "2018-10-23T02:29:00.263+00:00"
}