Wowza Streaming Engine 4.11.2 release notes

Version: Wowza Streaming Engine™ 4.11.2+6 build 20260722195619 released June 22, 2026.

Java support: Wowza Streaming Engine 4.11.0 is compiled using Java 17 (OpenJDK Java SE JRE 17.0.12) but can be used with Java versions 17 or 21. For more details, see Java version information.

New features and functionality

This release focuses on stability and security. Three third-party libraries were updated to patch known CVEs: SRT (1.5.6), Spring Boot (3.5.14), and Jackson Core (2.18.9). On the bug fix side, a freeze affecting concurrent HLS liverepeater edge streams (introduced in 4.11.0) has been resolved — customers running HLS liverepeater edges should upgrade. Additional fixes address a ConcurrentModificationException during live ingest, reduce CPU overhead during live stream buffer flushes, and add missing HSTS headers to 404 responses.

Detailed list of changes

Security

• Updated the SRT library to version 1.5.6 to resolve CVE-2026-55869 and CVE-2026-55868.
• Updated Spring Boot to version 3.5.14 to resolve CVE-2026-40973.
• Updated Jackson Core to version 2.18.9 to resolve CVE-2026-54512, CVE-2026-54513.

Bug Fixes

• A bug introduced in 4.11.0 causing apps processing concurrent HLS liverepeater edge streams to freeze and require a restart has been fixed.
• Customers using HLS liverepeater edges should upgrade their version.
• Reduced CPU overhead in live stream buffer flushes by trimming stale packets before copying the buffer.
• Fixed a bug in live streams causing ConcurrentModificationException errors and log noise.
• HSTS headers were previously missing in 404 responses and have been added.

Known issues

For a detailed list of currently known issues, see Known issues with Wowza Streaming Engine.