Libarchive: libarchive: signed integer overflow in archive_write_zip_header

• azl3 libarchive 3.7.7-6 on Azure Linux 3.0

• azl3 libarchive 3.7.7-7 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 26, 2026 at 9:00 AM UTC
   • The vendor changed its remediation guidance.
2. Sep 28, 2026 at 11:20 AM UTC
   • The vendor changed its remediation guidance.

1. Jul 25, 2026 at 1:05 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 3, 2026 at 11:40 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

3. Oct 26, 2026 at 1:48 AM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

4. Oct 28, 2026 at 9:50 AM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.