Amazon Linux 2023 Security Advisory: ALAS2023-2026-1583
Advisory Released Date: 2026-04-13
Advisory Updated Date: 2026-04-13
FAQs regarding Amazon Linux ALAS/CVE Severity
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 inline
document type definition containing a deeply nested content model a C stack
overflow occurs. (CVE-2026-4224)
The webbrowser.open() API would accept leading dashes in the URL which
could be handled as command line options for certain web browsers. New
behavior rejects leading dashes. Users are recommended to sanitize URLs
prior to passing to webbrowser.open(). (CVE-2026-4519)
Affected Packages:
python3.9
Issue Correction:
Run dnf update python3.9 --releasever 2023.11.20260413 or dnf update --advisory ALAS2023-2026-1583 --releasever 2023.11.20260413 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
python3-3.9.25-1.amzn2023.0.4.aarch64
python3-devel-3.9.25-1.amzn2023.0.4.aarch64
python3.9-debugsource-3.9.25-1.amzn2023.0.4.aarch64
python3-idle-3.9.25-1.amzn2023.0.4.aarch64
python3-tkinter-3.9.25-1.amzn2023.0.4.aarch64
python3-debug-3.9.25-1.amzn2023.0.4.aarch64
python3.9-debuginfo-3.9.25-1.amzn2023.0.4.aarch64
python3-libs-3.9.25-1.amzn2023.0.4.aarch64
python3-test-3.9.25-1.amzn2023.0.4.aarch64
noarch:
python-unversioned-command-3.9.25-1.amzn2023.0.4.noarch
src:
python3.9-3.9.25-1.amzn2023.0.4.src
x86_64:
python3-devel-3.9.25-1.amzn2023.0.4.x86_64
python3.9-debugsource-3.9.25-1.amzn2023.0.4.x86_64
python3-tkinter-3.9.25-1.amzn2023.0.4.x86_64
python3.9-debuginfo-3.9.25-1.amzn2023.0.4.x86_64
python3-idle-3.9.25-1.amzn2023.0.4.x86_64
python3-3.9.25-1.amzn2023.0.4.x86_64
python3-test-3.9.25-1.amzn2023.0.4.x86_64
python3-debug-3.9.25-1.amzn2023.0.4.x86_64
python3-libs-3.9.25-1.amzn2023.0.4.x86_64