CVE-2026-49842

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability39. percentile0.4%

ProductFreeswitch

PublishedJun 9, 2026

First seenJun 9, 2026

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Update

freeswitch freeswitch1.11.1 or later

Affected products

Product	Affected versions	Fixed in
freeswitch freeswitch	v < 1.11.1	1.11.1

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