ALAS2023-2026-1444

References: CVE-2025-11468  CVE-2025-15282  CVE-2026-0672  CVE-2026-0865  CVE-2026-1299 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

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)

Issue Correction:
Run dnf update python3.12 --releasever 2023.10.20260216 or dnf update --advisory ALAS2023-2026-1444 --releasever 2023.10.20260216 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:

aarch64:
    python3.12-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-tkinter-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-devel-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-debug-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-idle-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-debugsource-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-debuginfo-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-libs-3.12.12-2.amzn2023.0.4.aarch64
    python3.12-test-3.12.12-2.amzn2023.0.4.aarch64

src:
    python3.12-3.12.12-2.amzn2023.0.4.src

x86_64:
    python3.12-debugsource-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-tkinter-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-devel-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-idle-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-debug-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-debuginfo-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-libs-3.12.12-2.amzn2023.0.4.x86_64
    python3.12-test-3.12.12-2.amzn2023.0.4.x86_64