Home / mailings [USN-8744-1] Python vulnerabilities
Posted on 10 September 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8744-1
September 10, 2026
python2.7, python3.4, python3.5, python3.6, python3.7, python3.8,
python3.9, python3.10, python3.11, python3.12, python3.14 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- 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 Python.
Software Description:
- python3.14: An interactive high-level object-oriented language
- python3.12: An interactive high-level object-oriented language
- python2.7: An interactive high-level object-oriented language
- python3.10: An interactive high-level object-oriented language
- python3.11: An interactive high-level object-oriented language
- python3.8: An interactive high-level object-oriented language
- python3.9: An interactive high-level object-oriented language
- python3.6: An interactive high-level object-oriented language
- python3.7: An interactive high-level object-oriented language
- python3.5: An interactive high-level object-oriented language
- python3.4: An interactive high-level object-oriented language
Details:
It was discovered that Python's http.cookies module incorrectly handled
control characters in certain cookie operations. An attacker could possibly
use this issue to inject arbitrary content. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,
Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-3644)
It was discovered that the Python pyexpat module was vulnerable to
unbounded recursion in the Expat XML parser. An attacker could possibly use
this issue to cause Python to crash, resulting in a denial of service. This
issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-4224)
It was discovered that Python's tarfile module did not correctly apply the
filter parameter when extracting hard links. An attacker could possibly use
this issue to cause files to be extracted with an unexpected uid or gid,
bypassing the restrictions requested via filter='data'. (CVE-2026-4360)
It was discovered that Python's http.cookies module incorrectly escaped
values in the js_output() method. An attacker could possibly use this issue
to inject arbitrary JavaScript. (CVE-2026-6019)
It was discovered that Python's html.parser module incorrectly handled
repeated unterminated markup declarations. An attacker could possibly use
this issue to cause Python to consume excessive CPU resources, leading to a
denial of service. (CVE-2026-15308)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
libpython3.14 3.14.4-1ubuntu0.2
python3.14 3.14.4-1ubuntu0.2
Ubuntu 24.04 LTS
libpython3.12t64 3.12.3-1ubuntu0.17
python3.12 3.12.3-1ubuntu0.17
Ubuntu 22.04 LTS
libpython2.7 2.7.18-13ubuntu1.5+esm9
Available with Ubuntu Pro
libpython3.10 3.10.12-1~22.04.18
libpython3.11 3.11.0~rc1-1~22.04.1+esm2
Available with Ubuntu Pro
python2.7 2.7.18-13ubuntu1.5+esm9
Available with Ubuntu Pro
python3.10 3.10.12-1~22.04.18
python3.11 3.11.0~rc1-1~22.04.1+esm2
Available with Ubuntu Pro
Ubuntu 20.04 LTS
libpython2.7 2.7.18-1~20.04.7+esm10
Available with Ubuntu Pro
libpython3.8 3.8.10-0ubuntu1~20.04.18+esm7
Available with Ubuntu Pro
libpython3.9 3.9.5-3ubuntu0~20.04.1+esm11
Available with Ubuntu Pro
python2.7 2.7.18-1~20.04.7+esm10
Available with Ubuntu Pro
python3.8 3.8.10-0ubuntu1~20.04.18+esm7
Available with Ubuntu Pro
python3.9 3.9.5-3ubuntu0~20.04.1+esm11
Available with Ubuntu Pro
Ubuntu 18.04 LTS
libpython2.7 2.7.17-1~18.04ubuntu1.13+esm15
Available with Ubuntu Pro
libpython3.6 3.6.9-1~18.04ubuntu1.13+esm10
Available with Ubuntu Pro
libpython3.7 3.7.5-2ubuntu1~18.04.2+esm11
Available with Ubuntu Pro
libpython3.8 3.8.0-3ubuntu1~18.04.2+esm11
Available with Ubuntu Pro
python2.7 2.7.17-1~18.04ubuntu1.13+esm15
Available with Ubuntu Pro
python3.6 3.6.9-1~18.04ubuntu1.13+esm10
Available with Ubuntu Pro
python3.7 3.7.5-2ubuntu1~18.04.2+esm11
Available with Ubuntu Pro
python3.8 3.8.0-3ubuntu1~18.04.2+esm11
Available with Ubuntu Pro
Ubuntu 16.04 LTS
libpython2.7 2.7.12-1ubuntu0~16.04.18+esm22
Available with Ubuntu Pro
libpython3.5 3.5.2-2ubuntu0~16.04.13+esm25
Available with Ubuntu Pro
python2.7 2.7.12-1ubuntu0~16.04.18+esm22
Available with Ubuntu Pro
python3.5 3.5.2-2ubuntu0~16.04.13+esm25
Available with Ubuntu Pro
Ubuntu 14.04 LTS
libpython2.7 2.7.6-8ubuntu0.6+esm30
Available with Ubuntu Pro
libpython3.4 3.4.3-1ubuntu1~14.04.7+esm21
Available with Ubuntu Pro
libpython3.5 3.5.2-2ubuntu0~16.04.4~14.04.1+esm11
Available with Ubuntu Pro
python2.7 2.7.6-8ubuntu0.6+esm30
Available with Ubuntu Pro
python3.4 3.4.3-1ubuntu1~14.04.7+esm21
Available with Ubuntu Pro
python3.5 3.5.2-2ubuntu0~16.04.4~14.04.1+esm11
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8744-1
CVE-2026-15308, CVE-2026-3644, CVE-2026-4224, CVE-2026-4360,
CVE-2026-6019
Package Information:
https://launchpad.net/ubuntu/+source/python3.14/3.14.4-1ubuntu0.2
https://launchpad.net/ubuntu/+source/python3.12/3.12.3-1ubuntu0.17
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