Bug 2567889 (CVE-2026-116782)

Summary: CVE-2026-116782 freeswitch: FreeSWITCH: Denial of Service via malformed RTMP connection request
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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Hardware: All   
OS: Linux   
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A flaw was found in FreeSWITCH. A remote, unauthenticated attacker can cause a Denial of Service (DoS) by sending a specially crafted connection request to an active Real-Time Messaging Protocol (RTMP) listener. Because the application fails to properly validate the data type of the connection argument before processing, an invalid memory read is triggered. This issue causes the service to crash immediately, terminating all ongoing calls.
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Description OSIDB Bzimport 2026-11-05 22:34:07 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, rtmp_i_connect() passed the first RTMP connect argument to amf0_object_get() without checking whether the AMF value was an object. A string or number in place of an AMF object caused union bytes from the message to be interpreted as node pointers and dereferenced. Any client with network access to an enabled mod_rtmp listener could send the malformed connect command before login; the module is disabled in the stock build and configuration. The invalid read reliably crashes FreeSWITCH and ends every active call, while no write, memory disclosure, or code execution has been demonstrated. This issue is fixed in version 1.11.2.