XZ Utils: Buffer overflow in lzma_index_append()

• azl3 xz 5.4.4-2 on Azure Linux 3.0

• cbl2 cmake 3.21.4-23 on CBL Mariner 2.0

• cbl2 xz 5.2.5-1 on CBL Mariner 2.0

• azl3 rust 1.75.0-27 on Azure Linux 3.0

• cbl2 xz 5.2.5-1 on CBL-Mariner 2.0

• cbl2 rust 1.72.0-15 on CBL Mariner 2.0

• azl3 rust 1.90.0-6 on Azure Linux 3.0

• azl3 xz 5.4.4-3 on Azure Linux 3.0

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. Oct 8, 2026 at 9:05 AM UTC
   • CVSS changed from not listed to 5.3.
   • Added affected products: cbl2 cmake 3.21.4-23, cbl2 cmake 3.21.4-23 on CBL-Mariner 2.0, cbl2 rust 1.72.0-15 on CBL-Mariner 2.0, cbl2 xz 5.2.5-1 on CBL-Mariner 2.0.
   • The vendor changed its remediation guidance.

1. Apr 4, 2026 at 1:02 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 25, 2026 at 2:27 AM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

3. Sep 27, 2026 at 11:11 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

4. Nov 10, 2026 at 2:00 AM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.