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Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS : Python vulnerabilities (USN-8744-1)

high Nessus Plugin ID 344659

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8744-1 advisory.

 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8744-1

Plugin Details

Severity: High

ID: 344659

File Name: ubuntu_USN-8744-1.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 9/11/2026

Updated: 9/11/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.74

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-3644

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 7.7

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-15308

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:pro:-:lts, p-cpe:/a:canonical:ubuntu_linux:idle-python2.7, p-cpe:/a:canonical:ubuntu_linux:idle-python3.10, p-cpe:/a:canonical:ubuntu_linux:idle-python3.11, p-cpe:/a:canonical:ubuntu_linux:idle-python3.12, p-cpe:/a:canonical:ubuntu_linux:idle-python3.14, p-cpe:/a:canonical:ubuntu_linux:idle-python3.4, p-cpe:/a:canonical:ubuntu_linux:idle-python3.5, p-cpe:/a:canonical:ubuntu_linux:idle-python3.6, p-cpe:/a:canonical:ubuntu_linux:idle-python3.7, p-cpe:/a:canonical:ubuntu_linux:idle-python3.8, p-cpe:/a:canonical:ubuntu_linux:idle-python3.9, p-cpe:/a:canonical:ubuntu_linux:libpython2.7-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython2.7-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython2.7-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython2.7, p-cpe:/a:canonical:ubuntu_linux:libpython3.10-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.10-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.10-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.10, p-cpe:/a:canonical:ubuntu_linux:libpython3.11-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.11-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.11-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.11, p-cpe:/a:canonical:ubuntu_linux:libpython3.12-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.12-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.12-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.12t64, p-cpe:/a:canonical:ubuntu_linux:libpython3.14-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.14-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.14-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.14, p-cpe:/a:canonical:ubuntu_linux:libpython3.4-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.4-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.4-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.4, p-cpe:/a:canonical:ubuntu_linux:libpython3.5-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.5-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.5-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.5, p-cpe:/a:canonical:ubuntu_linux:libpython3.6-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.6-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.6-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.6, p-cpe:/a:canonical:ubuntu_linux:libpython3.7-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.7-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.7-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.7, p-cpe:/a:canonical:ubuntu_linux:libpython3.8-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.8-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.8-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.8, p-cpe:/a:canonical:ubuntu_linux:libpython3.9-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.9-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.9-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.9, p-cpe:/a:canonical:ubuntu_linux:python2.7-examples, p-cpe:/a:canonical:ubuntu_linux:python2.7-minimal, p-cpe:/a:canonical:ubuntu_linux:python2.7, p-cpe:/a:canonical:ubuntu_linux:python3.10-examples, p-cpe:/a:canonical:ubuntu_linux:python3.10-full, p-cpe:/a:canonical:ubuntu_linux:python3.10-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.10-nopie, p-cpe:/a:canonical:ubuntu_linux:python3.10-venv, p-cpe:/a:canonical:ubuntu_linux:python3.10, p-cpe:/a:canonical:ubuntu_linux:python3.11-examples, p-cpe:/a:canonical:ubuntu_linux:python3.11-full, p-cpe:/a:canonical:ubuntu_linux:python3.11-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.11-nopie, p-cpe:/a:canonical:ubuntu_linux:python3.11-venv, p-cpe:/a:canonical:ubuntu_linux:python3.11, p-cpe:/a:canonical:ubuntu_linux:python3.12-examples, p-cpe:/a:canonical:ubuntu_linux:python3.12-full, p-cpe:/a:canonical:ubuntu_linux:python3.12-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.12-nopie, p-cpe:/a:canonical:ubuntu_linux:python3.12-venv, p-cpe:/a:canonical:ubuntu_linux:python3.12, p-cpe:/a:canonical:ubuntu_linux:python3.14-examples, p-cpe:/a:canonical:ubuntu_linux:python3.14-full, p-cpe:/a:canonical:ubuntu_linux:python3.14-gdbm, p-cpe:/a:canonical:ubuntu_linux:python3.14-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.14-nopie, p-cpe:/a:canonical:ubuntu_linux:python3.14-tk, p-cpe:/a:canonical:ubuntu_linux:python3.14-venv, p-cpe:/a:canonical:ubuntu_linux:python3.14, p-cpe:/a:canonical:ubuntu_linux:python3.4-examples, p-cpe:/a:canonical:ubuntu_linux:python3.4-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.4-venv, p-cpe:/a:canonical:ubuntu_linux:python3.4, p-cpe:/a:canonical:ubuntu_linux:python3.5-examples, p-cpe:/a:canonical:ubuntu_linux:python3.5-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.5-venv, p-cpe:/a:canonical:ubuntu_linux:python3.5, p-cpe:/a:canonical:ubuntu_linux:python3.6-examples, p-cpe:/a:canonical:ubuntu_linux:python3.6-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.6-venv, p-cpe:/a:canonical:ubuntu_linux:python3.6, p-cpe:/a:canonical:ubuntu_linux:python3.7-examples, p-cpe:/a:canonical:ubuntu_linux:python3.7-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.7-venv, p-cpe:/a:canonical:ubuntu_linux:python3.7, p-cpe:/a:canonical:ubuntu_linux:python3.8-examples, p-cpe:/a:canonical:ubuntu_linux:python3.8-full, p-cpe:/a:canonical:ubuntu_linux:python3.8-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.8-venv, p-cpe:/a:canonical:ubuntu_linux:python3.8, p-cpe:/a:canonical:ubuntu_linux:python3.9-examples, p-cpe:/a:canonical:ubuntu_linux:python3.9-full, p-cpe:/a:canonical:ubuntu_linux:python3.9-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.9-venv, p-cpe:/a:canonical:ubuntu_linux:python3.9

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/10/2026

Vulnerability Publication Date: 2/12/2026

Reference Information

CVE: CVE-2026-15308, CVE-2026-3644, CVE-2026-4224, CVE-2026-4360, CVE-2026-6019

USN: 8744-1