PT-2026-47849 · Signalwire · Freeswitch

Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-49842

NVD

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-49842

Affected Products

Freeswitch

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-49842 · Security Note
• https://github.com/signalwire/freeswitch/security/advisories/GHSA-p3gx-p2w7-wp35 · Note
• https://github.com/signalwire/freeswitch/releases/tag/v1.11.1 · Note