CVE-2026-49842: Freeswitch

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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, mod_verto's WebSocket frame loop intercepts a #-prefixed speed-test protocol (#SPU / #SPB / #SPE) before any authentication check. The declared payload size in #SPU was parsed with atoi() and only rejected non-positive values, so an unauthenticated peer could request up to INT_MAX bytes. The server then wrote roughly size * 10 bytes back during the download phase, on the order of 20 GB per request, yielding strong outbound bandwidth amplification from a short request. This issue has been patched in version 1.11.1.

Affected products

• Freeswitch Freeswitch: before 1.11.1 (fixed in 1.11.1)

Published 2026-06-09. Last modified 2026-07-23.