SignalWire FreeSWITCH up to 1.11.1 MSRP Parser msrp.conf.xml msrp_parse_buffer buffer overflow

Summaryinfo

A vulnerability labeled as critical has been found in SignalWire FreeSWITCH up to 1.11.1. Affected by this issue is the function msrp_parse_buffer of the file msrp.conf.xml of the component MSRP Parser. Such manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2026-116569. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in SignalWire FreeSWITCH up to 1.11.1. It has been rated as critical. Affected by this issue is the function msrp_parse_buffer of the file msrp.conf.xml of the component MSRP Parser. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and 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 1.11.2, msrp_parse_buffer() subtracted delimiter framing from a peer-controlled short segment whose MSRP byte range ended in * without first proving the segment was long enough. The unsigned result wrapped near SIZE_MAX and reached switch_msrp_msg_set_payload() as both an allocation size and memcpy length, while related pointer arithmetic could read before the receive buffer. The listener is disabled by default in msrp.conf.xml, but any deployment enabling an MSRP TCP or TLS port parses this framing before authentication. An unauthenticated network peer can corrupt memory and crash FreeSWITCH, dropping all active calls, although remote code execution has not been demonstrated. This issue is fixed in version 1.11.2.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-116569 since 10/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

By approaching the search of inurl:msrp.conf.xml it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.11.2 eliminates this vulnerability.

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Productinfo

Vendor

• SignalWire

Name

• FreeSWITCH

Version

• 1.11.0
• 1.11.1

Website

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

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