CVE-2026-49842 FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, modverto's WebSocket frame loop intercepts a -prefixed speed-test protocol SPU / SPB / SP...

CVE-2026-49842

CVE-2026-49842 - FreeSWITCH mod_verto pre-auth bandwidth amplification : Before v1.11.1, FreeSWITCH’s mod_verto WebSocket frame loop processed a #-prefixed speed-test protocol (#SPU/#SPB/#SPE) prior to authentication. The payload size in #SPU was parsed with atoi() and non-positive values were re...

CVE-2026-49842 FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, modverto's WebSocket frame loop intercepts a -prefixed speed-test protocol SPU / SPB / SP...