CVE-2026-49842FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames
Descripción
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.
Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.
Productos y versiones afectados
| Fabricante | Producto | Versiones | |
|---|---|---|---|
| freeswitch | freeswitch | < 1.11.1 | |
| signalwire | freeswitch | < 1.11.1 |
Referencias y parches
- https://github.com/signalwire/freeswitch/security/advisories/GHSA-p3gx-p2w7-wp35 Third Party Advisory
- https://github.com/signalwire/freeswitch/releases/tag/v1.11.1 Release Notes
Coincidencias CPE (NVD) (1)
cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*< 1.11.1