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Ubuntu 22.04 Python 2.7 Critical Denial of Service Vuln USN-8018-3

ubuntu
Calendar Grey March 19, 2026
Dist Ubuntu Esm H88
Critical security updates for Python 2.7 in multiple Ubuntu releases to fix denial of service and HTTP header injection issues.
Several security issues were fixed in python2.7

Summary

Several security issues were fixed in python2.7

Software Description:

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

Details:

USN-8018-1 fixed CVE-2025-12084, CVE-2025-15282, CVE-2026-0672,

CVE-2026-0865 for python3. This update provides the corresponding updates

for python2.7.

Original advisory details:

Denis Ledoux discovered that Python incorrectly parsed email message

headers. An attacker could possibly use this issue to inject arbitrary

headers into email messages. This issue only affected python3.6,

python3.7, python3.8, python3.9, python3.10, python3.11, python3.12,

python3.13, and python3.14 packages. (CVE-2025-11468)

Jacob Walls, Shai Berger, and Natalia Bidart discovered that Python

inefficiently parsed XML input with quadratic complexity. An attacker

could possibly use this issue to cause a denial of service.

(CVE-2025-12084)

It was discovered that Python incorrectly parsed malicious plist files. An

attacker could possibly use this i...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu python2.7 email injection

Update Instructions

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

Ubuntu 22.04 LTS
  libpython2.7                    2.7.18-13ubuntu1.5+esm8
                                  Available with Ubuntu Pro
  python2.7                       2.7.18-13ubuntu1.5+esm8
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  libpython2.7                    2.7.18-1~20.04.7+esm9
                                  Available with Ubuntu Pro
  python2.7                       2.7.18-1~20.04.7+esm9
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libpython2.7                    2.7.17-1~18.04ubuntu1.13+esm14
                                  Available with Ubuntu Pro
  python2.7                       2.7.17-1~18.04ubuntu1.13+esm14
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libpython2.7                    2.7.12-1ubuntu0~16.04.18+esm19
                                  Available with Ubuntu Pro
  python2.7                       2.7.12-1ubuntu0~16.04.18+esm19
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  libpython2.7                    2.7.6-8ubuntu0.6+esm29
                                  Available with Ubuntu Pro
  python2.7                       2.7.6-8ubuntu0.6+esm29
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8018-3

https://ubuntu.com/security/notices/USN-8018-2

https://ubuntu.com/security/notices/USN-8018-1

CVE-2025-12084, CVE-2025-15282, CVE-2026-0672, CVE-2026-0865

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8018-3

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu python2.7 email injection

Package Information

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