miniupnpd — security advisory
miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.
- Products
- miniupnpd
- Affected versions
- 2.3.1-1, 2.3.10-1, 2.3.3-1, 2.3.4-1, 2.3.7-1, 2.3.7-2, 2.3.9-1, 2.3.9-2
- Fixed versions
- 2.3.10-1, 2.3.9-2+deb13u1
- CVEs
- CVE-2026-5720
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:39 UTC · Revision 2
Source evidence
miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.
osv:DEBIAN-CVE-2026-5720
miniupnpd
Fixed versions: Not specified
miniupnpd
Fixed versions: 2.3.9-2+deb13u1
miniupnpd
Fixed versions: 2.3.10-1
Complete source record
{
"id": "23668715f7c58f358a9edf5968f73239b2508a923994078f14544e9bdcf0d99f",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-5720",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-5720",
"summary": "miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.",
"evidence": "osv:DEBIAN-CVE-2026-5720",
"products": [
{
"name": {
"value": "miniupnpd",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.3.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.10-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.7-2",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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{
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}
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{
"name": {
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}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-5720",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
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}
],
"package": {
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"purl": "pkg:deb/debian/miniupnpd?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"2.3.3-1",
"2.3.4-1",
"2.3.7-1",
"2.3.7-2",
"2.3.9-1",
"2.3.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5720.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.9-2+deb13u1"
}
]
}
],
"package": {
"name": "miniupnpd",
"purl": "pkg:deb/debian/miniupnpd?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.3.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5720.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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{
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],
"package": {
"name": "miniupnpd",
"purl": "pkg:deb/debian/miniupnpd?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5720.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:29.346261374Z",
"provider": "osv",
"upstream": [
"CVE-2026-5720"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-5720"
]
},
"related_cves": [
{
"value": "CVE-2026-5720",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 460956,
"published_at": "2026-04-17T22:16:33.803+00:00"
}