libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

• azl3 expat 2.8.2-1 on Azure Linux 3.0

• azl3 cmake 3.30.3-15 on Azure Linux 3.0

• azl3 python3 3.12.9-14 on Azure Linux 3.0

Separate remediation guidance was not included in the collected bulletin.

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

1. Aug 24, 2026 at 8:10 AM UTC
   • Added affected products: azl3 cmake 3.30.3-15 on Azure Linux 3.0, azl3 python3 3.12.9-14 on Azure Linux 3.0.

1. Aug 21, 2026 at 2:02 PM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Aug 23, 2026 at 7:50 AM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

3. Aug 24, 2026 at 1:44 AM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

4. Oct 28, 2026 at 3:45 AM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.