CVE-2026-49843

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/signalwire/freeswitch/releases/tag/v1.11.1	Release Notes
https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-09 17:17

Updated : 2026-07-23 08:10

NVD link : CVE-2026-49843

Mitre link : CVE-2026-49843

CVE.ORG link : CVE-2026-49843

JSON object : View

Products Affected

freeswitch

freeswitch

CWE

CWE-287

Improper Authentication

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