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

[Starburst-David]

CVE ID :CVE-2026-116788
Published : Nov. 5, 2026
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.

https://cvefeed.io/vuln/detail/CVE-2026-116788