CVE-2026-116787 FreeSWITCH: Pre-authentication process termination in the Event Socket via an unbounded Content-Length
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116787?
CVE-2026-116787 is a high-severity vulnerability in signalwire freeswitch, published on 5 Nov 2026.
Official description
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, 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.
Which versions are affected by CVE-2026-116787?
It affects 1 product.
Products include Freeswitch.
How do I fix CVE-2026-116787?
No fix has been published for CVE-2026-116787 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116787 being exploited?
There is no known exploitation of CVE-2026-116787 in the wild and no public exploit code.
Other vulnerabilities in signalwire freeswitch
- CVE-2026-116779 SignalWire FreeSwitch Code Injection
- CVE-2026-49841 FreeSWITCH: Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read
- CVE-2019-19492 FreeSWITCH 1.6.10 through 1.10.1 has a default password in event_socket.conf.xml.
- CVE-2026-116785 FreeSWITCH: Pre-authentication heap out-of-bounds write in mod_xml_rpc WebSocket frame length handling
- CVE-2026-116790 FreeSWITCH: Inbound ICE connectivity checks are accepted without verifying STUN MESSAGE-INTEGRITY
Sources
Also known as GHSA-j27c-m99r-8pc3.