CVE-2026-116785 FreeSWITCH: Pre-authentication heap out-of-bounds write in mod_xml_rpc WebSocket frame length handling
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116785?
CVE-2026-116785 is a critical 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, ws_read_frame() decoded a WebSocket frame's 64-bit extended payload length with a 32-bit byte swap and narrowed the result into a signed length. A value whose surviving low word became negative bypassed the signed size check and was reinterpreted as an enormous unsigned count, causing client bytes to overwrite memory beyond the 64 KiB receive buffer. Any client completing a /socket WebSocket upgrade on an enabled mod_xml_rpc endpoint reached the parser before HTTP authentication; both the module and WebSocket endpoint are disabled by default. The heap overwrite can corrupt connection pointers and crash FreeSWITCH, ending every concurrent session, although remote code execution has not been demonstrated. This issue is fixed in version 1.11.2.
Which versions are affected by CVE-2026-116785?
It affects 1 product.
Products include Freeswitch.
How do I fix CVE-2026-116785?
No fix has been published for CVE-2026-116785 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116785 being exploited?
There is no known exploitation of CVE-2026-116785 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-2026-116790 FreeSWITCH: Inbound ICE connectivity checks are accepted without verifying STUN MESSAGE-INTEGRITY
- CVE-2026-49840 FreeSWITCH: Pre-authentication heap buffer overflow in libesl `Content-Length` parsing
Sources
Also known as GHSA-jj89-q47c-gh94.