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Ubuntu 26.04 Python Marshmallow Critical DoS and Info Leak USN-8225

Linuxsecurity •LinuxSecurity Advisories • April 30, 2026

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)

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.

CVE-2018-17175, CVE-2025-68480

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Critical Vulnerabilities in Python Marshmallow Affect Multiple Ubuntu Releases On April 30, 2026, Ubuntu released a security notice (USN-8225) addressing critical vulnerabilities in the Python marshmallow library. The vulnerabilities include CVE-2018-17175, which allows information leakage on Ubuntu 18.04 LTS, and CVE-2025-68480, which enables denial of service attacks on Ubuntu versions 20.04 LTS, 22.04 LTS, 24.04 LTS, and 26.04 LTS. The first vulnerability was discovered by Jared Deckard and pertains to improper handling of field visibility, while the second involves inefficient object merging. Users of affected Ubuntu versions are advised to update their systems to mitigate these risks. The patches are available through standard system updates. The vulnerabilities pose significant risks, especially for systems still running older LTS versions. Immediate action is recommended to secure affected systems. 2 sources 71

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Ubuntu 26.04 Python Marshmallow Critical DoS and Info Leak USN-8225

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CVEs (2)

CWE Weaknesses (1)