High
upx-ucl — security advisory
A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.
- Products
- upx-ucl
- Affected versions
- 3.95-2, 3.95-2build1, 3.96-2, 3.96-3, 4.2.2-3, 4.2.4-1, 4.2.4-1.1, 4.2.4-1.1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2020-27799
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:52 UTC · Revision 1
Source evidence
A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.
osv:UBUNTU-CVE-2020-27799
upx-ucl
Fixed versions: Not specified
upx-ucl
Fixed versions: Not specified
upx-ucl
Fixed versions: Not specified
upx-ucl
Fixed versions: Not specified
upx-ucl
Fixed versions: Not specified
upx-ucl
Fixed versions: Not specified
Complete source record
{
"id": "b5296fba309f2a651c52190e4b48233a588c20fe0783be1b4c69e9843b5342e7",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-27799",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2020-27799",
"summary": "A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.",
"evidence": "osv:UBUNTU-CVE-2020-27799",
"products": [
{
"name": {
"value": "upx-ucl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.95-2",
"evidence": "/affected/0/versions"
},
{
"value": "3.95-2build1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "upx-ucl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.96-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.96-3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "upx-ucl",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.96-3",
"evidence": "/affected/2/versions"
},
{
"value": "4.2.2-3",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "upx-ucl",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.4-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.2.4-1.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "upx-ucl",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.4-1.1build1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "upx-ucl",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.4-1.1",
"evidence": "/affected/5/versions"
},
{
"value": "4.2.4-1.1build1",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2020-27799",
"aliases": [
"UBUNTU-CVE-2020-27799"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "upx-ucl",
"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"3.95-2",
"3.95-2build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27799.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "upx-ucl",
"binary_version": "3.95-2build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "upx-ucl",
"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"3.96-2",
"3.96-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27799.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "upx-ucl",
"binary_version": "3.96-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "upx-ucl",
"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"3.96-3",
"4.2.2-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27799.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "upx-ucl",
"binary_version": "4.2.2-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "upx-ucl",
"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"4.2.4-1",
"4.2.4-1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27799.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "upx-ucl",
"binary_version": "4.2.4-1.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "upx-ucl",
"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"4.2.4-1.1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27799.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "upx-ucl",
"binary_version": "4.2.4-1.1build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "upx-ucl",
"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"4.2.4-1.1",
"4.2.4-1.1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27799.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "upx-ucl",
"binary_version": "4.2.4-1.1build1"
}
]
}
}
],
"modified": "2026-10-17T12:56:13.614027981Z",
"provider": "osv",
"upstream": [
"CVE-2020-27799"
],
"references": [
"https://ubuntu.com/security/CVE-2020-27799",
"https://github.com/upx/upx/issues/391",
"https://github.com/upx/upx/commit/8764fdc24c31c21dc43b2a2f99eb8c48a34e5e9c",
"https://www.cve.org/CVERecord?id=CVE-2020-27799"
]
},
"related_cves": [
{
"value": "CVE-2020-27799",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354979,
"published_at": "2022-08-25T20:15:00+00:00"
}