Amazon Linux 2023 : python3.14, python3.14-devel, python3.14-freethreading (ALAS2023-2026-3406)

critical Nessus Plugin ID 377947

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3406 advisory.

tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() with filter=tar to write files outside the destination directory, subject to the permissions of the extracting process.

This is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter.
(CVE-2026-114583)

Python has added a denylist for known compromised certificates to the ssl module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration. (CVE-2026-115557)

The cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition. An attacker who can modify the tree during cleanup can replace a directory with a symbolic link, causing files outside of the temporary directory to be deleted or have their permissions and file flags reset, with the privileges of the process performing the cleanup. Note that platforms where shutil.rmtree.avoids_symlink_attacks is false, remain affected, and file flags may still be reset outside of the tree on all platforms.
(CVE-2026-12345)

When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None. (CVE-2026-87910)

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 python3.14 --releasever 2023.12.20261109' or or 'dnf update --advisory ALAS2023-2026-3406 --releasever 2023.12.20261109' to update your system.

Plugin Details

Severity: Critical

ID: 377947

File Name: al2023_ALAS2023-2026-3406.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.1

Percentile: 98.06

CVSS v2

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.3

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

CVSS Score Source: CVE-2026-12345

CVSS v3

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 5.7

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.4

Threat Score: 8.6

Threat Vector: CVSS:4.0/E:P

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

CVSS Score Source: CVE-2026-115557

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python3.14-debug, p-cpe:/a:amazon:linux:python3.14-debuginfo, p-cpe:/a:amazon:linux:python3.14-debugsource, p-cpe:/a:amazon:linux:python3.14-devel, p-cpe:/a:amazon:linux:python3.14-freethreading-debug, p-cpe:/a:amazon:linux:python3.14-freethreading-devel, p-cpe:/a:amazon:linux:python3.14-freethreading-idle, p-cpe:/a:amazon:linux:python3.14-freethreading-libs, p-cpe:/a:amazon:linux:python3.14-freethreading-test, p-cpe:/a:amazon:linux:python3.14-freethreading-tkinter, p-cpe:/a:amazon:linux:python3.14-freethreading, p-cpe:/a:amazon:linux:python3.14-idle, p-cpe:/a:amazon:linux:python3.14-libs, p-cpe:/a:amazon:linux:python3.14-test, p-cpe:/a:amazon:linux:python3.14-tkinter, p-cpe:/a:amazon:linux:python3.14

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/9/2026

Vulnerability Publication Date: 8/20/2026

Reference Information

CVE: CVE-2026-114583, CVE-2026-115557, CVE-2026-12345, CVE-2026-87910

IAVA: 2026-A-0890-S, 2026-A-1207

Detections

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