ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling.

• azl3 ruby 3.3.5-8 on Azure Linux 3.0

• azl3 ruby 3.3.5-10 on Azure Linux 3.0

• azl3 rubygem-webrick 1.8.1-3 on Azure Linux 3.0

• azl3 ruby 3.3.5-9 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 28, 2026 at 11:20 AM UTC
   • Added affected products: azl3 ruby 3.3.5-9 on Azure Linux 3.0, azl3 ruby 3.3.5-10 on Azure Linux 3.0.
   • The vendor changed its remediation guidance.

1. Jul 9, 2026 at 1:02 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. Sep 24, 2026 at 2:17 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.