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Amazon Linux 2023 : python3.13, python3.13-devel, python3.13-freethreading (ALAS2023-2026-1910)

high Nessus Plugin ID 327378

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Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1910 advisory.

 tarfile.extractall() with the 'data' or 'tar'filter could be bypassed by a crafted archive where a hardlinkreferences a symlink stored at a deeper name than the hardlink itself.The extraction fallback validated the symlink at it's archived locationbut recreated it at the hardlink's shallowerpath, letting a relativetarget the filter judged contained escape the destination directory.This allowed a malicious tar archive to create a symlink pointingoutside the destination, enabling out-of-destination file reads orwrites. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

 CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host. (CVE-2026-1502)

 unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms. (CVE-2026-3276)

 `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch. (CVE-2026-7210)

 tarfile.data_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() to write files outside the destination directory, subject to the permissions of the extracting process. (CVE-2026-7774)

 The ftpcp() function in Lib/ftplib.py was not updated whenCVE-2021-4189 was fixed. While makepasv() was patched to replaceserver-supplied PASV host addresses with the actual peer address(getpeername()[0]), ftpcp() still calls parse227() directly and passesthe raw attacker-controllable IP address and port to target.sendport(). This patch is related to CVE-2021-4189. (CVE-2026-8328)

 bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data. (CVE-2026-9669)

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 python3.13 --releasever 2023.12.20260706' or or 'dnf update --advisory ALAS2023-2026-1910 --releasever 2023.12.20260706' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1910.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-11940.html

https://explore.alas.aws.amazon.com/CVE-2026-1502.html

https://explore.alas.aws.amazon.com/CVE-2026-3276.html

https://explore.alas.aws.amazon.com/CVE-2026-7210.html

https://explore.alas.aws.amazon.com/CVE-2026-7774.html

https://explore.alas.aws.amazon.com/CVE-2026-8328.html

https://explore.alas.aws.amazon.com/CVE-2026-9669.html

Plugin Details

Severity: High

ID: 327378

File Name: al2023_ALAS2023-2026-1910.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/16/2026

Updated: 7/16/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.78

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-7210

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 4.6

Threat Vector: CVSS:4.0/E:U

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

CVSS Score Source: CVE-2026-9669

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:python3.13, p-cpe:/a:amazon:linux:python3.13-tkinter, p-cpe:/a:amazon:linux:python3.13-idle, p-cpe:/a:amazon:linux:python3.13-debug, p-cpe:/a:amazon:linux:python3.13-freethreading, p-cpe:/a:amazon:linux:python3.13-test, p-cpe:/a:amazon:linux:python3.13-devel, p-cpe:/a:amazon:linux:python3.13-freethreading-debug, p-cpe:/a:amazon:linux:python3.13-debugsource, p-cpe:/a:amazon:linux:python3.13-libs, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python3.13-debuginfo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/7/2026

Vulnerability Publication Date: 4/10/2026

Reference Information

CVE: CVE-2026-11940, CVE-2026-1502, CVE-2026-3276, CVE-2026-7210, CVE-2026-7774, CVE-2026-8328, CVE-2026-9669

IAVA: 2026-A-0360-S, 2026-A-0549