CVE-2026-116788 FreeSWITCH: Pre-authentication heap buffer overflow in core XML empty-entity decoding

What is CVE-2026-116788?

CVE-2026-116788 is a high-severity vulnerability in signalwire freeswitch, published on 5 Nov 2026.

Official description

FreeSWITCH is an open-source software telecommunications platform. Before version 1.11.2, an integer underflow in  switch_xml_decode()  can cause an undersized heap allocation when an XML document declares an entity with an empty replacement value. Subsequent copying overruns the allocated buffer. An unauthenticated attacker who can reach a SIP profile with presence management enabled and DTD processing permitted can trigger the vulnerability through a crafted SIP PUBLISH request. Exploitation can corrupt heap memory and terminate the FreeSWITCH process, interrupting all active calls. This vulnerability is fixed in version 1.11.2.

Weakness: CWE-131, CWE-191, CWE-122

Which versions are affected by CVE-2026-116788?

It affects 1 product.

Products include Freeswitch.

How do I fix CVE-2026-116788?

No fix has been published for CVE-2026-116788 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-116788 being exploited?

There is no known exploitation of CVE-2026-116788 in the wild and no public exploit code.

Other vulnerabilities in signalwire freeswitch

• CVE-2026-116779 SignalWire FreeSwitch Code Injection Exploited Critical 9.8
• CVE-2026-49841 FreeSWITCH: Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read Critical 9.8
• CVE-2019-19492 FreeSWITCH 1.6.10 through 1.10.1 has a default password in event_socket.conf.xml. Critical 9.8
• CVE-2026-116785 FreeSWITCH: Pre-authentication heap out-of-bounds write in mod_xml_rpc WebSocket frame length handling Critical 9.1
• CVE-2026-116790 FreeSWITCH: Inbound ICE connectivity checks are accepted without verifying STUN MESSAGE-INTEGRITY Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-f73w-xph4-pjp3.