signalwire FreeSWITCH up to 1.11.0 recursion

Summaryinfo

A vulnerability was found in signalwire FreeSWITCH up to 1.11.0. It has been declared as problematic. Affected by this vulnerability is an unknown functionality. Executing a manipulation can lead to recursion. This vulnerability is handled as CVE-2026-49847. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in signalwire FreeSWITCH up to 1.11.0 and classified as problematic. This vulnerability affects some unknown processing. The manipulation with an unknown input leads to a recursion vulnerability. The CWE definition for the vulnerability is CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-49847 since 06/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 1.11.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• signalwire

Name

• FreeSWITCH

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11.0

Website

• Product: https://github.com/signalwire/freeswitch/

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