Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-005
Advisory Released Date: 2026-09-18
Advisory Updated Date: 2026-11-02
Severity:
Important
Issue Overview:
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers. (CVE-2026-56132)
Affected Packages:
expat
Issue Correction:
Run dnf update expat --releasever 2027.0.20260914 or dnf update --advisory ALAS2027-2026-005 --releasever 2027.0.20260914 to update your system.
New Packages:
aarch64:
expat-static-2.8.1-1.amzn2027.aarch64
expat-devel-2.8.1-1.amzn2027.aarch64
expat-debugsource-2.8.1-1.amzn2027.aarch64
expat-debuginfo-2.8.1-1.amzn2027.aarch64
expat-2.8.1-1.amzn2027.aarch64
src:
expat-2.8.1-1.amzn2027.src
x86_64:
expat-debugsource-2.8.1-1.amzn2027.x86_64
expat-debuginfo-2.8.1-1.amzn2027.x86_64
expat-devel-2.8.1-1.amzn2027.x86_64
expat-2.8.1-1.amzn2027.x86_64
expat-static-2.8.1-1.amzn2027.x86_64