ALAS2023-2026-1913

References: CVE-2026-56403  CVE-2026-56406  CVE-2026-56407 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

libexpat before 2.8.2 has an integer overflow in storeAtts. (CVE-2026-56403)

libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse. (CVE-2026-56406)

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen. (CVE-2026-56407)

Issue Correction:
Run dnf update expat --releasever 2023.12.20260706 or dnf update --advisory ALAS2023-2026-1913 --releasever 2023.12.20260706 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:
    expat-static-2.6.3-1.amzn2023.0.6.aarch64
    expat-debugsource-2.6.3-1.amzn2023.0.6.aarch64
    expat-debuginfo-2.6.3-1.amzn2023.0.6.aarch64
    expat-devel-2.6.3-1.amzn2023.0.6.aarch64
    expat-2.6.3-1.amzn2023.0.6.aarch64

src:
    expat-2.6.3-1.amzn2023.0.6.src

x86_64:
    expat-debugsource-2.6.3-1.amzn2023.0.6.x86_64
    expat-static-2.6.3-1.amzn2023.0.6.x86_64
    expat-debuginfo-2.6.3-1.amzn2023.0.6.x86_64
    expat-2.6.3-1.amzn2023.0.6.x86_64
    expat-devel-2.6.3-1.amzn2023.0.6.x86_64