Amazon Linux 2 Security Advisory: ALAS2-2026-3218
Advisory Released Date: 2026-04-01
Advisory Updated Date: 2026-04-01
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output(). (CVE-2026-3644)
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)
Affected Packages:
python
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update python or yum update --advisory ALAS2-2026-3218 to update your system.
aarch64:
python-2.7.18-1.amzn2.0.17.aarch64
python-libs-2.7.18-1.amzn2.0.17.aarch64
python-devel-2.7.18-1.amzn2.0.17.aarch64
python-tools-2.7.18-1.amzn2.0.17.aarch64
tkinter-2.7.18-1.amzn2.0.17.aarch64
python-test-2.7.18-1.amzn2.0.17.aarch64
python-debug-2.7.18-1.amzn2.0.17.aarch64
python-debuginfo-2.7.18-1.amzn2.0.17.aarch64
i686:
python-2.7.18-1.amzn2.0.17.i686
python-libs-2.7.18-1.amzn2.0.17.i686
python-devel-2.7.18-1.amzn2.0.17.i686
python-tools-2.7.18-1.amzn2.0.17.i686
tkinter-2.7.18-1.amzn2.0.17.i686
python-test-2.7.18-1.amzn2.0.17.i686
python-debug-2.7.18-1.amzn2.0.17.i686
python-debuginfo-2.7.18-1.amzn2.0.17.i686
src:
python-2.7.18-1.amzn2.0.17.src
x86_64:
python-2.7.18-1.amzn2.0.17.x86_64
python-libs-2.7.18-1.amzn2.0.17.x86_64
python-devel-2.7.18-1.amzn2.0.17.x86_64
python-tools-2.7.18-1.amzn2.0.17.x86_64
tkinter-2.7.18-1.amzn2.0.17.x86_64
python-test-2.7.18-1.amzn2.0.17.x86_64
python-debug-2.7.18-1.amzn2.0.17.x86_64
python-debuginfo-2.7.18-1.amzn2.0.17.x86_64