Bug 2567928 (CVE-2026-116569)

Summary: CVE-2026-116569 freeswitch: FreeSWITCH: Denial of Service via integer underflow in MSRP parser
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in FreeSWITCH. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending specially crafted Message Session Relay Protocol (MSRP) network traffic to an enabled listener. Due to insufficient length validation during delimiter framing parsing, an integer underflow can trigger memory corruption, crashing the service and terminating active calls.
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Description OSIDB Bzimport 2026-11-05 22:37:03 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, 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.