Perl versions from 5.9.4 before 5.41.9 produce incorrect regular expression match results when a stale failure flag ends the Aho-Corasick prescan early in S_find_byclass

• azl3 perl 5.38.2-514 on Azure Linux 3.0

• azl3 perl 5.38.2-516 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. Sep 27, 2026 at 11:11 PM UTC
   • Added affected products: azl3 perl 5.38.2-516 on Azure Linux 3.0.

1. Aug 23, 2026 at 3:03 PM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Aug 24, 2026 at 8:10 AM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

3. Sep 10, 2026 at 3:33 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.