Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser

• azl3 libX11 1.8.7-1 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 17, 2026 at 12:05 PM UTC
   • Added fixed versions: 1.8.7-2.

1. Sep 29, 2026 at 1:05 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 29, 2026 at 11:40 AM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

3. Oct 17, 2026 at 1:43 AM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

4. Nov 13, 2026 at 3:10 PM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.