CVE-2026-116787 · Runtime
NO FIX YET · SEE WHAT TO DO
A malformed Content-Length header on FreeSWITCH's Event Socket module, parsed before authentication, can overflow an allocation and make the process abort. Any host allowed by the inbound ACL can stop the service with one packet, dropping all active calls until restart.
first public Oct 28, 2026 · 1 source
Check it with your coding agent
It checks your repository and tells you if you’re affected, with the fix.
Systems running FreeSWITCH older than 1.11.2 with mod_event_socket loaded. The default loopback ACL limits exposure to local clients, so a standard install is at risk mainly where the ACL admits other hosts or where FreeSWITCH connects out to an application server that could be hostile. Installations that use only the loopback ACL with no outbound socket dialplan are lower risk.
Not affected if default-config, fixed-version, no-event-socket
Who cares freeswitch, self-hosted, telephony
fs_cli -x version or freeswitch -versionapply-inbound-acl allows in event_socket.conf.xml1.11.2 or laterFreeSWITCH 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, mod_event_socket used an unauthenticated Content-Length value directly as the allocation size for an Event Socket message body. Negative or extremely large values could overflow the terminator calculation or force an allocation failure through a helper that aborts the FreeSWITCH process. The header is parsed before the Event Socket password, so any host admitted by apply-inbound-acl can trigger termination with its first packet; the default loopback ACL limits ordinary installations to local clients. The outbound socket dialplan path is also affected when FreeSWITCH connects to a hostile application server, and process termination drops every active call until the service is restarted. This issue is fixed in version 1.11.2.
Are you affected?
Tell InfraStack what you run. It checks this one, and every next one, against your stack.
Ask from here. InfraStack checks the affected versions against your stack and answers in your inbox.
InfraStack checks the affected versions against your stack and answers in Slack, with the evidence and the fix.
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.