High
upx-ucl — security advisory
PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of a malware scanner to operate on the entire original data, or possibly have unspecified other impact via a crafted file.
- Products
- upx-ucl
- Affected versions
- 3.91-1, 3.94-2, 3.94-3, 3.94-4, 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-2018-11243
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:22 UTC · Revision 1
Source evidence
PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of a malware scanner to operate on the entire original data, or possibly have unspecified other impact via a crafted file.
osv:UBUNTU-CVE-2018-11243
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
upx-ucl
Fixed versions: Not specified
upx-ucl
Fixed versions: Not specified
Complete source record
{
"id": "34d312c343d9548b12a4e75a29faee20a8702c4d18cc829800c51d6b92f9db23",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-11243",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2018-11243",
"summary": "PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of a malware scanner to operate on the entire original data, or possibly have unspecified other impact via a crafted file.",
"evidence": "osv:UBUNTU-CVE-2018-11243",
"products": [
{
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"evidence": "/affected/0/package/name"
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{
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{
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"evidence": "/affected/1/package/name"
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"affected_versions": [
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"evidence": "/affected/1/versions"
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{
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{
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{
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],
"severity": "high",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
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]
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],
"package": {
"name": "upx-ucl",
"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"3.91-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-11243.json"
},
"ecosystem_specific": {
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"binary_version": "3.91-1"
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}
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{
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"package": {
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"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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"3.94-3",
"3.94-4"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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"package": {
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"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/2018/UBUNTU-CVE-2018-11243.json"
},
"ecosystem_specific": {
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{
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"binary_version": "3.95-2build1"
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}
},
{
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"package": {
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"purl": "pkg:deb/ubuntu/upx-ucl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
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"3.96-3"
],
"database_specific": {
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"ecosystem_specific": {
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},
"versions": [
"3.96-3",
"4.2.2-3"
],
"database_specific": {
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"ecosystem_specific": {
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},
"versions": [
"4.2.4-1",
"4.2.4-1.1"
],
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},
"ecosystem_specific": {
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
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],
"database_specific": {
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},
"ecosystem_specific": {
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]
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},
{
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"package": {
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"4.2.4-1.1build1"
],
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},
"ecosystem_specific": {
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{
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}
]
}
}
],
"modified": "2026-10-17T12:53:32.247774244Z",
"provider": "osv",
"upstream": [
"CVE-2018-11243"
],
"references": [
"https://ubuntu.com/security/CVE-2018-11243",
"https://github.com/upx/upx/issues/206",
"https://github.com/upx/upx/issues/207",
"https://github.com/upx/upx/blob/devel/NEWS",
"https://www.cve.org/CVERecord?id=CVE-2018-11243"
]
},
"related_cves": [
{
"value": "CVE-2018-11243",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 353449,
"published_at": "2018-05-18T17:29:00+00:00"
}