Amazon Linux 2 Security Advisory: ALAS2-2026-3184
Advisory Released Date: 2026-03-06
Advisory Updated Date: 2026-03-06
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)
Affected Packages:
python3
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 python3 or yum update --advisory ALAS2-2026-3184 to update your system.
aarch64:
python3-3.7.16-1.amzn2.0.23.aarch64
python3-libs-3.7.16-1.amzn2.0.23.aarch64
python3-devel-3.7.16-1.amzn2.0.23.aarch64
python3-tools-3.7.16-1.amzn2.0.23.aarch64
python3-tkinter-3.7.16-1.amzn2.0.23.aarch64
python3-test-3.7.16-1.amzn2.0.23.aarch64
python3-debug-3.7.16-1.amzn2.0.23.aarch64
python3-debuginfo-3.7.16-1.amzn2.0.23.aarch64
i686:
python3-3.7.16-1.amzn2.0.23.i686
python3-libs-3.7.16-1.amzn2.0.23.i686
python3-devel-3.7.16-1.amzn2.0.23.i686
python3-tools-3.7.16-1.amzn2.0.23.i686
python3-tkinter-3.7.16-1.amzn2.0.23.i686
python3-test-3.7.16-1.amzn2.0.23.i686
python3-debug-3.7.16-1.amzn2.0.23.i686
python3-debuginfo-3.7.16-1.amzn2.0.23.i686
src:
python3-3.7.16-1.amzn2.0.23.src
x86_64:
python3-3.7.16-1.amzn2.0.23.x86_64
python3-libs-3.7.16-1.amzn2.0.23.x86_64
python3-devel-3.7.16-1.amzn2.0.23.x86_64
python3-tools-3.7.16-1.amzn2.0.23.x86_64
python3-tkinter-3.7.16-1.amzn2.0.23.x86_64
python3-test-3.7.16-1.amzn2.0.23.x86_64
python3-debug-3.7.16-1.amzn2.0.23.x86_64
python3-debuginfo-3.7.16-1.amzn2.0.23.x86_64