MediumFix available
python-marshmallow — security advisory
Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. In versions from 3.0.0rc1 to before 3.26.2 and from 4.0.0 to before 4.1.2, Schema.load(data, many=True) is vulnerable to denial of service attacks. A moderately sized request can consume a disproportionate amount of CPU time. This issue has been patched in version 3.26.2 and 4.1.2.
- Products
- python-marshmallow
- Affected versions
- 3.18.0-1, 3.20.1-1, 3.20.1-1.1, 3.26.1-0.1, 3.26.1-0.2, 3.26.1-0.3, 3.26.1-0.4, 3.26.2-0.1, 3.26.2-0.2
- Fixed versions
- 3.26.2-0+deb13u1, 3.26.2-0.1
- CVEs
- CVE-2025-68480
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 02:04 UTC · Revision 1
Source evidence
Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. In versions from 3.0.0rc1 to before 3.26.2 and from 4.0.0 to before 4.1.2, Schema.load(data, many=True) is vulnerable to denial of service attacks. A moderately sized request can consume a disproportionate amount of CPU time. This issue has been patched in version 3.26.2 and 4.1.2.
osv:DEBIAN-CVE-2025-68480
python-marshmallow
Fixed versions: Not specified
python-marshmallow
Fixed versions: 3.26.2-0+deb13u1
python-marshmallow
Fixed versions: 3.26.2-0.1
Complete source record
{
"id": "5cc21ff8b93cdac97a9d075a0ad693d4d07fe5f91c9d94f4a43860bc7a863d0e",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-68480",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-68480",
"summary": "Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. In versions from 3.0.0rc1 to before 3.26.2 and from 4.0.0 to before 4.1.2, Schema.load(data, many=True) is vulnerable to denial of service attacks. A moderately sized request can consume a disproportionate amount of CPU time. This issue has been patched in version 3.26.2 and 4.1.2.",
"evidence": "osv:DEBIAN-CVE-2025-68480",
"products": [
{
"name": {
"value": "python-marshmallow",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.18.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.20.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.20.1-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.26.1-0.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.26.1-0.2",
"evidence": "/affected/0/versions"
},
{
"value": "3.26.1-0.3",
"evidence": "/affected/0/versions"
},
{
"value": "3.26.1-0.4",
"evidence": "/affected/0/versions"
},
{
"value": "3.26.2-0.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.26.2-0.2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "python-marshmallow",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.26.2-0+deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "3.26.1-0.2",
"evidence": "/affected/1/versions"
},
{
"value": "3.26.1-0.3",
"evidence": "/affected/1/versions"
},
{
"value": "3.26.1-0.4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "python-marshmallow",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.26.2-0.1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "3.26.1-0.2",
"evidence": "/affected/2/versions"
},
{
"value": "3.26.1-0.3",
"evidence": "/affected/2/versions"
},
{
"value": "3.26.1-0.4",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2025-68480",
"aliases": [
"DEBIAN-CVE-2025-68480"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-marshmallow",
"purl": "pkg:deb/debian/python-marshmallow?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.18.0-1",
"3.20.1-1",
"3.20.1-1.1",
"3.26.1-0.1",
"3.26.1-0.2",
"3.26.1-0.3",
"3.26.1-0.4",
"3.26.2-0.1",
"3.26.2-0.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68480.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.26.2-0+deb13u1"
}
]
}
],
"package": {
"name": "python-marshmallow",
"purl": "pkg:deb/debian/python-marshmallow?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.26.1-0.2",
"3.26.1-0.3",
"3.26.1-0.4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68480.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.26.2-0.1"
}
]
}
],
"package": {
"name": "python-marshmallow",
"purl": "pkg:deb/debian/python-marshmallow?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.26.1-0.2",
"3.26.1-0.3",
"3.26.1-0.4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68480.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:05:30.584662197Z",
"provider": "osv",
"upstream": [
"CVE-2025-68480"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-68480"
]
},
"related_cves": [
{
"value": "CVE-2025-68480",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 424455,
"published_at": "2025-12-22T22:16:09.457+00:00"
}