Bug 2567789 (CVE-2026-116786)

Summary: CVE-2026-116786 freeswitch: FreeSWITCH: Arbitrary command execution via SIP REFER parameter injection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FreeSWITCH. An authenticated caller on an active call can execute arbitrary operating-system commands with the privileges of the FreeSWITCH process. By sending a specially crafted Session Initiation Protocol (SIP) REFER request containing unvalidated parameters, an attacker can inject malicious call variables that trigger unauthorized system commands during call setup.
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Description OSIDB Bzimport 2026-11-05 22:26:11 UTC 
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, sofia_handle_sip_i_refer() placed raw Refer-To URI parameters and headers inside a sip_invite_params channel-variable block passed to switch_ivr_originate(). The originate parser treated a comma in the attacker-controlled value as a variable separator, allowing an authenticated caller on a bridged call to inject arbitrary variables into a newly originated leg. An injected execute_on_originate value could invoke the system dialplan application before answer and execute operating-system commands with the FreeSWITCH process privileges. SIP REFER is enabled by default, and the sender needs only a registered account and a call that takes the off-box transfer path, not administrative or Event Socket access. This issue is fixed in version 1.11.2.