========================================================================== Ubuntu Security Notice USN-8018-3 March 19, 2026
python2.7 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
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 issue to cause Python to use excessive
resources, leading to a denial of service. This issue only affected
python3.5, python3.6, python3.7, python3.8, python3.9, python3.10,
python3.11, python3.12, python3.13, and python3.14 packages.
(CVE-2025-13837)
Omar Hasan discovered that Python incorrectly parsed URL mediatypes. An
attacker could possibly use this issue to inject arbitrary HTTP headers.
(CVE-2025-15282)
Omar Hasan discovered that Python incorrectly parsed malicious IMAP
inputs. An attacker could possibly use this issue to inject arbitrary
IMAP commands. (CVE-2025-15366)
Omar Hasan discovered that Python incorrectly parsed malicious POP3
inputs. An attacker could possibly use this issue to inject arbitrary
POP3 commands. (CVE-2025-15367)
Omar Hasan discovered that Python incorrectly parsed malicious HTTP cookie
headers. An attacker could possibly use this issue to inject arbitrary
HTTP headers. (CVE-2026-0672)
Omar Hasan discovered that Python incorrectly parsed malicious HTTP header
names and values. An attacker could possibly use this issue to inject
arbitrary HTTP headers. (CVE-2026-0865)
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
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