Alerts This Week
Warning Icon 1 677
Alerts This Week
Warning Icon 1 677

Ubuntu 26.04 Python Marshmallow Critical DoS and Info Leak USN-8225-1

ubuntu
Calendar Grey April 30, 2026
Dist Ubuntu Esm H88
Ubuntu releases fixed several critical security issues in Python marshmallow affecting multiple LTS versions. Act promptly.
Several security issues were fixed in Python marshmallow.

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)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu information leakage python-marshmallow

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8225-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu information leakage python-marshmallow

Package Information

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here