CVE-2026-45771 — Freeswitch Denial-of-Service in SIP PUBLISH Requests via XML Entity Expansion
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hard…
Published: 2026-06-09 · CVSS: 7.5 · CVSS 3.1
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 version 1.11.0, FreeSWITCH's bundled XML parser expands nested <!ENTITY> declarations without a depth or count bound, so a small DTD can describe a body that expands exponentially ("billion laughs"). The PIDF body of a SIP PUBLISH is fed to this parser before any digest check, letting an unauthenticated network attacker force unbounded CPU and memory consumption with a single request. This issue has been patched in version 1.11.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7