CVE-2026-116782 · Runtime
NO FIX YET · SEE WHAT TO DO
FreeSWITCH before 1.11.2 mishandles a malformed RTMP connect command, reading invalid memory when a string or number is sent where an AMF object is expected. The invalid read reliably crashes FreeSWITCH and ends every active call; no code execution or data disclosure has been demonstrated.
first public Oct 28, 2026 · 1 source
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Only deployments that enable the mod_rtmp listener are exposed; the module is disabled in the stock build and configuration. An unauthenticated client with network access to that listener can crash the server before login. Systems running FreeSWITCH without mod_rtmp enabled can skip this issue.
Not affected if default-config, mod-rtmp-disabled
Who cares freeswitch, self-hosted, telephony
fs_cli -x version or the installed package version; affected versions are before 1.11.2.mod_rtmp in the modules.conf and the autoload_configs/rtmp.conf.xml configuration.1.11.2 or later.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.
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