USN-7015-7: Python 2.7 regression

Publication date

29 September 2025

Overview

USN-7015-4 introduced a regression in Python 2.7


Packages

  • python2.7 - An interactive high-level object-oriented language

Details

USN-7015-4 fixed vulnerabilities in Python. It was discovered that the fix
for CVE-2023-27043 for python2.7 was incorrectly applied on Ubuntu 16.04
LTS and Ubuntu 18.04 LTS. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the Python email module incorrectly parsed email
addresses that contain special characters. A remote attacker could
possibly use this issue to bypass certain protection mechanisms.
(CVE-2023-27043)

It was discovered that Python allowed excessive backtracking while parsing
certain tarfile headers. A remote attacker could possibly use this issue
to cause Python to consume resources, leading to a denial of service.
(CVE-2024-6232)

It was discovered that the Python email module incorrectly quoted newlines
...

USN-7015-4 fixed vulnerabilities in Python. It was discovered that the fix
for CVE-2023-27043 for python2.7 was incorrectly applied on Ubuntu 16.04
LTS and Ubuntu 18.04 LTS. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the Python email module incorrectly parsed email
addresses that contain special characters. A remote attacker could
possibly use this issue to bypass certain protection mechanisms.
(CVE-2023-27043)

It was discovered that Python allowed excessive backtracking while parsing
certain tarfile headers. A remote attacker could possibly use this issue
to cause Python to consume resources, leading to a denial of service.
(CVE-2024-6232)

It was discovered that the Python email module incorrectly quoted newlines
for email headers. A remote attacker could possibly use this issue to
perform header injection. (CVE-2024-6923)

It was discovered that the Python http.cookies module incorrectly handled
parsing cookies that contained backslashes for quoted characters. A remote
attacker could possibly use this issue to cause Python to consume
resources, leading to a denial of service. (CVE-2024-7592)

It was discovered that the Python zipfile module incorrectly handled
certain malformed zip files. A remote attacker could possibly use this
issue to cause Python to stop responding, resulting in a denial of
service. (CVE-2024-8088)


Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
18.04 bionic libpython2.7 –  2.7.17-1~18.04ubuntu1.13+esm13  
python2.7 –  2.7.17-1~18.04ubuntu1.13+esm13  
16.04 xenial libpython2.7 –  2.7.12-1ubuntu0~16.04.18+esm18  
python2.7 –  2.7.12-1ubuntu0~16.04.18+esm18  

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