CVE-2026-49847

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, a single unauthenticated WebSocket frame containing a deeply nested JSON document crashes the FreeSWITCH process via stack overflow, terminating all calls and sessions on the host. The recursion drives the worker thread's stack pointer into the stack guard page, raising SIGSEGV from the kernel before any usable write primitive develops. This issue has been patched in version 1.11.1.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

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-2v74-pcgh-75wg	Third Party Advisory

Configurations

Configuration 1 (hide)

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

History

10 Jun 2026, 15:06

Type	Values Removed	Values Added
CPE		cpe:2.3:a:freeswitch:freeswitch::::::::
References	~~() https://github.com/signalwire/freeswitch/releases/tag/v1.11.1 -~~	() https://github.com/signalwire/freeswitch/releases/tag/v1.11.1 - Release Notes
References	~~() https://github.com/signalwire/freeswitch/security/advisories/GHSA-2v74-pcgh-75wg -~~	() https://github.com/signalwire/freeswitch/security/advisories/GHSA-2v74-pcgh-75wg - Third Party Advisory
First Time		Freeswitch freeswitch Freeswitch

09 Jun 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-09 17:17

Updated : 2026-06-17 10:55

NVD link : CVE-2026-49847

Mitre link : CVE-2026-49847

CVE.ORG link : CVE-2026-49847

JSON object : View

Products Affected

freeswitch

freeswitch

CWE

CWE-674

Uncontrolled Recursion

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