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
- 3.0.0b14-1, 3.10.0-1, 3.13.0-1, 3.18.0-1, 3.2.1-1, 3.2.2-1, 3.20.1-1.1, 3.26.1-0.2, 3.26.1-0.3, 3.26.1-0.4, 3.26.2-0.1, 3.3.0-1, 3.4.0-1
- Fixed versions
- 3.13.0-1ubuntu0.1~esm1, 3.20.1-1.1ubuntu0.1~esm1, 3.26.1-0.4ubuntu0.1~esm1, 3.4.0-1ubuntu0.1~esm1
- CVEs
- CVE-2025-68480
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:55 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:UBUNTU-CVE-2025-68480
python-marshmallow
Fixed versions: 3.4.0-1ubuntu0.1~esm1
python-marshmallow
Fixed versions: 3.13.0-1ubuntu0.1~esm1
python-marshmallow
Fixed versions: 3.20.1-1.1ubuntu0.1~esm1
python-marshmallow
Fixed versions: Not specified
python-marshmallow
Fixed versions: Not specified
python-marshmallow
Fixed versions: 3.26.1-0.4ubuntu0.1~esm1
Complete source record
{
"id": "748990c8b5de4311d337d9d38a6666eab080070eee41af5389e8961f7eea041a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-68480",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-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:UBUNTU-CVE-2025-68480",
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"severity": "medium",
"structured": {
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"aliases": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
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{
"type": "Ubuntu",
"score": "medium"
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"versions": [
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"modified": "2026-10-17T12:57:39.551233879Z",
"provider": "osv",
"upstream": [
"CVE-2025-68480"
],
"references": [
"https://ubuntu.com/security/CVE-2025-68480",
"https://www.cve.org/CVERecord?id=CVE-2025-68480",
"https://github.com/marshmallow-code/marshmallow/security/advisories/GHSA-428g-f7cq-pgp5",
"https://github.com/marshmallow-code/marshmallow/commit/218d98a785d3bd25dad8880bb07e9cce70340f31",
"https://github.com/marshmallow-code/marshmallow/commit/70141f4180fb94ced3544cdefdaff89172dd3956",
"https://github.com/marshmallow-code/marshmallow/commit/36f87877d0e889e682386a0121eabe030cde57b1",
"https://github.com/marshmallow-code/marshmallow/commit/0356a3f1c307830f8ded56d823abca5611c594c9",
"https://github.com/marshmallow-code/marshmallow/commit/6d4a17dad54ea9711040c6aa6ba4d59267242a41",
"https://github.com/marshmallow-code/marshmallow/commit/489a8d421dc7955bb53b89e962d69465fbc5b6af",
"https://github.com/marshmallow-code/marshmallow/commit/d24a0c9df061c4daa92f71cf85aca25b83eee508",
"https://ubuntu.com/security/notices/USN-8225-1"
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"source_id": "core-osv",
"document_id": 357659,
"published_at": "2025-12-22T22:16:00+00:00"
}