nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

• azl4 nghttp2 1.66.0-9.azl4 on Azure Linux 4.0

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 27, 2026 at 9:20 AM UTC
   • Added affected products: azl4 nghttp2 1.66.0-9.azl4 on Azure Linux 4.0.
   • Removed affected products: azl4 nmap 4:7.92-12.azl4 on Azure Linux 4.0.
2. Oct 22, 2026 at 7:40 AM UTC
   • Added affected products: azl4 nmap 4:7.92-12.azl4 on Azure Linux 4.0.
   • Removed affected products: azl3 fluent-bit 3.1.10-6 on Azure Linux 3.0, azl3 nghttp2 1.61.0-3 on Azure Linux 3.0, azl3 rust 1.75.0-30 on Azure Linux 3.0, azl3 rust 1.90.0-9 on Azure Linux 3.0.
   • Added fixed versions: 0:1.66.0-9.azl4.
   • The vendor changed its remediation guidance.

1. Jun 29, 2026 at 1:06 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 28, 2026 at 11:20 AM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

3. Oct 22, 2026 at 1:15 AM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

4. Nov 11, 2026 at 2:20 AM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.