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[USN-7015-7] Python 2.7 regression

Posted on 29 September 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7015-7
September 29, 2025

python2.7 regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN-7015-4 introduced a regression in Python 2.7

Software Description:
- 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
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:

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

Ubuntu 18.04 LTS
libpython2.7 2.7.17-1~18.04ubuntu1.13+esm13
Available with Ubuntu Pro
python2.7 2.7.17-1~18.04ubuntu1.13+esm13
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libpython2.7 2.7.12-1ubuntu0~16.04.18+esm18
Available with Ubuntu Pro
python2.7 2.7.12-1ubuntu0~16.04.18+esm18
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7015-7
https://ubuntu.com/security/notices/USN-7015-6
https://ubuntu.com/security/notices/USN-7015-5
https://ubuntu.com/security/notices/USN-7015-4
https://ubuntu.com/security/notices/USN-7015-3
https://ubuntu.com/security/notices/USN-7015-2
https://ubuntu.com/security/notices/USN-7015-1
CVE-2023-27043, https://launchpad.net/bugs/2125702

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