CVE-2026-45771: Freeswitch

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Freeswitch Freeswitch: before 1.11.0 (fixed in 1.11.0)

Published 2026-06-09. Last modified 2026-07-20.