Amazon Linux 2023 Security Advisory: ALAS2023-2026-1786
Advisory Released Date: 2026-06-08
Advisory Updated Date: 2026-06-08
Severity:
Medium
Issue Overview:
http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value. (CVE-2026-6019)
Affected Packages:
python3.13
Issue Correction:
Run dnf update python3.13 --releasever 2023.12.20260608 or dnf update --advisory ALAS2023-2026-1786 --releasever 2023.12.20260608 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:
python3.13-tkinter-3.13.13-1.amzn2023.0.3.aarch64
python3.13-idle-3.13.13-1.amzn2023.0.3.aarch64
python3.13-3.13.13-1.amzn2023.0.3.aarch64
python3.13-freethreading-debug-3.13.13-1.amzn2023.0.3.aarch64
python3.13-devel-3.13.13-1.amzn2023.0.3.aarch64
python3.13-debugsource-3.13.13-1.amzn2023.0.3.aarch64
python3.13-debug-3.13.13-1.amzn2023.0.3.aarch64
python3.13-libs-3.13.13-1.amzn2023.0.3.aarch64
python3.13-debuginfo-3.13.13-1.amzn2023.0.3.aarch64
python3.13-test-3.13.13-1.amzn2023.0.3.aarch64
python3.13-freethreading-3.13.13-1.amzn2023.0.3.aarch64
src:
python3.13-3.13.13-1.amzn2023.0.3.src
x86_64:
python3.13-3.13.13-1.amzn2023.0.3.x86_64
python3.13-tkinter-3.13.13-1.amzn2023.0.3.x86_64
python3.13-freethreading-debug-3.13.13-1.amzn2023.0.3.x86_64
python3.13-devel-3.13.13-1.amzn2023.0.3.x86_64
python3.13-debugsource-3.13.13-1.amzn2023.0.3.x86_64
python3.13-idle-3.13.13-1.amzn2023.0.3.x86_64
python3.13-debug-3.13.13-1.amzn2023.0.3.x86_64
python3.13-debuginfo-3.13.13-1.amzn2023.0.3.x86_64
python3.13-libs-3.13.13-1.amzn2023.0.3.x86_64
python3.13-test-3.13.13-1.amzn2023.0.3.x86_64
python3.13-freethreading-3.13.13-1.amzn2023.0.3.x86_64