HighFix available
lwip — security advisory
lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.
- Products
- lwip
- Affected versions
- 2.1.3+dfsg1-2, 2.1.3+dfsg1-3, 2.1.3+dfsg1-4, 2.2.0+dfsg1-1, 2.2.0+dfsg1-2, 2.2.0+dfsg1-3, 2.2.0+dfsg1-4, 2.2.0+dfsg1-5, 2.2.0+dfsg1-6, 2.2.0+dfsg1-6.1, 2.2.0+dfsg1-6.1~exp1, 2.2.0+dfsg1-7, 2.2.0+dfsg1-8, 2.2.0+dfsg1-9, 2.2.1+dfsg1-1, 2.2.1+dfsg1-1+deb13u1, 2.2.1+dfsg1-2, 2.2.1+dfsg1-3, 2.2.1+dfsg1-4, 2.2.1+dfsg1-5, 2.2.1+dfsg1-6, 2.2.1+dfsg1-7, 2.2.1+dfsg1-8
- Fixed versions
- 2.2.1+dfsg1-8
- CVEs
- CVE-2026-91018
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 13:31 UTC · Revision 1
Source evidence
lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.
osv:DEBIAN-CVE-2026-91018
lwip
Fixed versions: Not specified
lwip
Fixed versions: Not specified
lwip
Fixed versions: 2.2.1+dfsg1-8
Complete source record
{
"id": "43e170076dd4d0f432163b7d60fe5d45dd091671b677d7eca4761c336d32a766",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-91018",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-91018",
"summary": "lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.",
"evidence": "osv:DEBIAN-CVE-2026-91018",
"products": [
{
"name": {
"value": "lwip",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.1.3+dfsg1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.1.3+dfsg1-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.1.3+dfsg1-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-5",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-6",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-6.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-6.1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-7",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-8",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0+dfsg1-9",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-5",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-6",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-7",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1+dfsg1-8",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "lwip",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.1+dfsg1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-5",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-6",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-7",
"evidence": "/affected/1/versions"
},
{
"value": "2.2.1+dfsg1-8",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "lwip",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.2.1+dfsg1-8",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "2.2.1+dfsg1-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.2.1+dfsg1-2",
"evidence": "/affected/2/versions"
},
{
"value": "2.2.1+dfsg1-3",
"evidence": "/affected/2/versions"
},
{
"value": "2.2.1+dfsg1-4",
"evidence": "/affected/2/versions"
},
{
"value": "2.2.1+dfsg1-5",
"evidence": "/affected/2/versions"
},
{
"value": "2.2.1+dfsg1-6",
"evidence": "/affected/2/versions"
},
{
"value": "2.2.1+dfsg1-7",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-91018",
"aliases": [
"DEBIAN-CVE-2026-91018"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lwip",
"purl": "pkg:deb/debian/lwip?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.1.3+dfsg1-2",
"2.1.3+dfsg1-3",
"2.1.3+dfsg1-4",
"2.2.0+dfsg1-1",
"2.2.0+dfsg1-2",
"2.2.0+dfsg1-3",
"2.2.0+dfsg1-4",
"2.2.0+dfsg1-5",
"2.2.0+dfsg1-6",
"2.2.0+dfsg1-6.1",
"2.2.0+dfsg1-6.1~exp1",
"2.2.0+dfsg1-7",
"2.2.0+dfsg1-8",
"2.2.0+dfsg1-9",
"2.2.1+dfsg1-1",
"2.2.1+dfsg1-2",
"2.2.1+dfsg1-3",
"2.2.1+dfsg1-4",
"2.2.1+dfsg1-5",
"2.2.1+dfsg1-6",
"2.2.1+dfsg1-7",
"2.2.1+dfsg1-8"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91018.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lwip",
"purl": "pkg:deb/debian/lwip?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.2.1+dfsg1-1",
"2.2.1+dfsg1-1+deb13u1",
"2.2.1+dfsg1-2",
"2.2.1+dfsg1-3",
"2.2.1+dfsg1-4",
"2.2.1+dfsg1-5",
"2.2.1+dfsg1-6",
"2.2.1+dfsg1-7",
"2.2.1+dfsg1-8"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91018.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.2.1+dfsg1-8"
}
]
}
],
"package": {
"name": "lwip",
"purl": "pkg:deb/debian/lwip?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.2.1+dfsg1-1",
"2.2.1+dfsg1-2",
"2.2.1+dfsg1-3",
"2.2.1+dfsg1-4",
"2.2.1+dfsg1-5",
"2.2.1+dfsg1-6",
"2.2.1+dfsg1-7"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91018.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-10T05:00:09.563604705Z",
"provider": "osv",
"upstream": [
"CVE-2026-91018"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-91018"
]
},
"related_cves": [
{
"value": "CVE-2026-91018",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 125987,
"published_at": "2026-09-22T21:17:33.29+00:00"
}