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[USN-8225-1] Python marshmallow vulnerabilities

Posted on 30 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8225-1
April 30, 2026

python-marshmallow vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Python marshmallow.

Software Description:
- python-marshmallow: ORM/ODM/framework-agnostic library for converting complex datatypes.

Details:

Jared Deckard discovered that Python marshmallow did not correctly
handle hiding certain fields. An attacker could possibly use this issue
to leak sensitive information. This issue only affected Ubuntu 18.04 LTS.
(CVE-2018-17175)

It was discovered that Python marshmallow did not efficiently handle
merging certain objects. An attacker could possibly use this issue to
cause a denial of service. This issue only affected Ubuntu 20.04 LTS,
Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2025-68480)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
python3-marshmallow 3.26.1-0.4ubuntu0.1~esm1
Available with Ubuntu Pro
python3-marshmallow-doc 3.26.1-0.4ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 24.04 LTS
python3-marshmallow 3.20.1-1.1ubuntu0.1~esm1
Available with Ubuntu Pro
python3-marshmallow-doc 3.20.1-1.1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
python3-marshmallow 3.13.0-1ubuntu0.1~esm1
Available with Ubuntu Pro
python3-marshmallow-doc 3.13.0-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
python3-marshmallow 3.4.0-1ubuntu0.1~esm1
Available with Ubuntu Pro
python3-marshmallow-doc 3.4.0-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python3-marshmallow 3.0.0b3-1ubuntu0.1~esm1
Available with Ubuntu Pro
python3-marshmallow-doc 3.0.0b3-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8225-1
CVE-2018-17175, CVE-2025-68480

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