CVE-2025-68480

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python-marshmallow	26.04 LTS resolute	Fixed 3.26.1-0.4ubuntu0.1~esm1
	25.10 questing	Vulnerable
	25.04 plucky	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 3.20.1-1.1ubuntu0.1~esm1
	22.04 LTS jammy	Fixed 3.13.0-1ubuntu0.1~esm1
	20.04 LTS focal	Fixed 3.4.0-1ubuntu0.1~esm1
	18.04 LTS bionic	Not affected

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
python-marshmallow	Upstream: 0356a3f Upstream: 6d4a17d Upstream: 489a8d4

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

USN-8225-1
Python marshmallow vulnerabilities
30 April 2026