Detections
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Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1583)
high Nessus Plugin ID 306206
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1583 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)
The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire. (CVE-2026-2297)
When an Expat parser with a registered ElementDeclHandler parses an inlinedocument type definition containing a deeply nested content model a C stackoverflow occurs. (CVE-2026-4224)
The webbrowser.open() API would accept leading dashes in the URL whichcould be handled as command line options for certain web browsers. Newbehavior rejects leading dashes. Users are recommended to sanitize URLsprior to passing to webbrowser.open(). (CVE-2026-4519)
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 python3.9 --releasever 2023.11.20260413' or or 'dnf update --advisory ALAS2023-2026-1583 --releasever 2023.11.20260413' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1583.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2025-11468.html
https://explore.alas.aws.amazon.com/CVE-2025-15282.html
https://explore.alas.aws.amazon.com/CVE-2026-0672.html
https://explore.alas.aws.amazon.com/CVE-2026-0865.html
https://explore.alas.aws.amazon.com/CVE-2026-1299.html
https://explore.alas.aws.amazon.com/CVE-2026-2297.html
Plugin Details
Severity: High
ID: 306206
File Name: al2023_ALAS2023-2026-1583.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 4/13/2026
Updated: 4/13/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
CVSS v2
Risk Factor: High
Base Score: 8.5
Temporal Score: 6.3
Vector: CVSS2#AV:N/AC:L/Au:N/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:H/PR:N/UI:R/S:U/C:H/I:H/A:L
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: CVE-2026-4519
CVSS v4
Risk Factor: High
Base Score: 7
Threat Score: 3.7
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score Source: CVE-2026-4519
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:python3-debug, p-cpe:/a:amazon:linux:python3-libs, p-cpe:/a:amazon:linux:python3-test, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python3, p-cpe:/a:amazon:linux:python3-devel, p-cpe:/a:amazon:linux:python3-tkinter, p-cpe:/a:amazon:linux:python-unversioned-command, p-cpe:/a:amazon:linux:python3-idle, p-cpe:/a:amazon:linux:python3.9-debuginfo, p-cpe:/a:amazon:linux:python3.9-debugsource
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 4/13/2026
Vulnerability Publication Date: 1/20/2026
Reference Information
CVE: CVE-2025-11468, CVE-2025-15282, CVE-2026-0672, CVE-2026-0865, CVE-2026-1299, CVE-2026-2297, CVE-2026-4224, CVE-2026-4519
IAVA: 2026-A-0142