HighFix available
swupdate — security advisory
SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.
- Products
- swupdate
- Affected versions
- 2022.12+dfsg-4, 2022.12+dfsg-4+deb12u1, 2022.12+dfsg-4+deb12u1~bpo11+1, 2024.12.1+dfsg-3, 2024.12.1+dfsg-3+deb13u1, 2025.05+dfsg-1, 2025.05+dfsg-2, 2025.05+dfsg-2~bpo13+1, 2025.05+dfsg-3, 2025.05+dfsg-3~bpo13+1, 2025.12+dfsg-1, 2025.12+dfsg-2, 2025.12+dfsg-2~bpo13+1, 2025.12+dfsg-3, 2025.12+dfsg-4, 2025.12+dfsg-5, 2025.12+dfsg-6, 2025.12+dfsg-7, 2025.12+dfsg-7~bpo13+1, 2025.12+dfsg-8
- Fixed versions
- 2022.12+dfsg-4+deb12u2, 2024.12.1+dfsg-3+deb13u2, 2025.12+dfsg-9
- CVEs
- CVE-2026-28525
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:50 UTC · Revision 2
Source evidence
SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.
osv:DEBIAN-CVE-2026-28525
swupdate
Fixed versions: 2022.12+dfsg-4+deb12u2
swupdate
Fixed versions: 2024.12.1+dfsg-3+deb13u2
swupdate
Fixed versions: 2025.12+dfsg-9
Complete source record
{
"id": "144f1dc8e969ab6d1423bc0f632282330f1a27c83523751dccbf590111cb8731",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-28525",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-28525",
"summary": "SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.",
"evidence": "osv:DEBIAN-CVE-2026-28525",
"products": [
{
"name": {
"value": "swupdate",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2022.12+dfsg-4+deb12u2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2022.12+dfsg-4",
"evidence": "/affected/0/versions"
},
{
"value": "2022.12+dfsg-4+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2022.12+dfsg-4+deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "swupdate",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2024.12.1+dfsg-3+deb13u2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "2024.12.1+dfsg-3",
"evidence": "/affected/1/versions"
},
{
"value": "2024.12.1+dfsg-3+deb13u1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "swupdate",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2025.12+dfsg-9",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "2024.12.1+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "2025.05+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2025.05+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "2025.05+dfsg-2~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2025.05+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "2025.05+dfsg-3~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-2~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-4",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-5",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-6",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-7",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-7~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2025.12+dfsg-8",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-28525",
"aliases": [
"DEBIAN-CVE-2026-28525"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/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"
},
{
"fixed": "2022.12+dfsg-4+deb12u2"
}
]
}
],
"package": {
"name": "swupdate",
"purl": "pkg:deb/debian/swupdate?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2022.12+dfsg-4",
"2022.12+dfsg-4+deb12u1",
"2022.12+dfsg-4+deb12u1~bpo11+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28525.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2024.12.1+dfsg-3+deb13u2"
}
]
}
],
"package": {
"name": "swupdate",
"purl": "pkg:deb/debian/swupdate?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2024.12.1+dfsg-3",
"2024.12.1+dfsg-3+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28525.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2025.12+dfsg-9"
}
]
}
],
"package": {
"name": "swupdate",
"purl": "pkg:deb/debian/swupdate?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2024.12.1+dfsg-3",
"2025.05+dfsg-1",
"2025.05+dfsg-2",
"2025.05+dfsg-2~bpo13+1",
"2025.05+dfsg-3",
"2025.05+dfsg-3~bpo13+1",
"2025.12+dfsg-1",
"2025.12+dfsg-2",
"2025.12+dfsg-2~bpo13+1",
"2025.12+dfsg-3",
"2025.12+dfsg-4",
"2025.12+dfsg-5",
"2025.12+dfsg-6",
"2025.12+dfsg-7",
"2025.12+dfsg-7~bpo13+1",
"2025.12+dfsg-8"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28525.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:43.735924796Z",
"provider": "osv",
"upstream": [
"CVE-2026-28525"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-28525"
]
},
"related_cves": [
{
"value": "CVE-2026-28525",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 461332,
"published_at": "2026-04-23T21:16:05.367+00:00"
}