Amazon Linux 2023 : python3.12, python3.12-devel, python3.12-idle (ALAS2023-2026-1444)

medium Nessus Plugin ID 299561

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1444 advisory.

When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized. (CVE-2025-11468)

User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype. (CVE-2025-15282)

When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.
(CVE-2026-0672)

User-controlled header names and values containing newlines can allow injecting HTTP headers.
(CVE-2026-0865)

The email module, specifically the BytesGenerator class, didn't properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized. This is only applicable if using LiteralHeader writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in BytesGenerator. (CVE-2026-1299)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'dnf update python3.12 --releasever 2023.10.20260216' or or 'dnf update --advisory ALAS2023-2026-1444 --releasever 2023.10.20260216' to update your system.

Plugin Details

Severity: Medium

ID: 299561

File Name: al2023_ALAS2023-2026-1444.nasl

Version: 1.1

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 2/19/2026

Updated: 2/19/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2026-1299

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:python3.12-debug, p-cpe:/a:amazon:linux:python3.12-debuginfo, p-cpe:/a:amazon:linux:python3.12-tkinter, p-cpe:/a:amazon:linux:python3.12, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python3.12-idle, p-cpe:/a:amazon:linux:python3.12-debugsource, p-cpe:/a:amazon:linux:python3.12-test, p-cpe:/a:amazon:linux:python3.12-libs, p-cpe:/a:amazon:linux:python3.12-devel

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 2/18/2026

Vulnerability Publication Date: 1/20/2026

Reference Information

CVE: CVE-2025-11468, CVE-2025-15282, CVE-2026-0672, CVE-2026-0865, CVE-2026-1299

IAVA: 2026-A-0142

Detections

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