Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-212
Advisory Release Date: 2026-10-26 09:00 Pacific
Advisory Updated Date: 2026-10-26 09:00 Pacific
Severity:
Important
Issue Overview:
Package updates are available for Amazon Linux 2027 that fix the following vulnerabilities:
CVE-2026-12043:
Improper handling of HPACK dynamic table size updates in the AWS Common Runtime aws-c-http library might allow a remote threat actor operating a server to cause memory corruption on a connecting client application, potentially leading to arbitrary code execution, via a crafted sequence of HTTP/2 HEADERS frames.
To remediate this issue, users should upgrade to aws-c-http version 0.11.0.
Affected Packages:
python-awscrt
Issue Correction:
Run dnf update python-awscrt or dnf update --advisory ALAS2027-2026-212 to update your system.
New Packages:
aarch64:
python3-awscrt-debuginfo-0.36.4-1.amzn2027.0.2.aarch64
python3-awscrt-0.36.4-1.amzn2027.0.2.aarch64
python-awscrt-debugsource-0.36.4-1.amzn2027.0.2.aarch64
src:
python-awscrt-0.36.4-1.amzn2027.0.2.src
x86_64:
python3-awscrt-debuginfo-0.36.4-1.amzn2027.0.2.x86_64
python3-awscrt-0.36.4-1.amzn2027.0.2.x86_64
python-awscrt-debugsource-0.36.4-1.amzn2027.0.2.x86_64