PT-2026-47850 · Signalwire · Freeswitch

Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-49843

NVD

CVSS v3.1

5.3

Medium

Base vector

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

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 JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-49843

Affected Products

Freeswitch

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-49843 · Security Note
• https://github.com/signalwire/freeswitch/releases/tag/v1.11.1 · Note
• https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m · Note