Vulnerability · Published Jun 9, 2026 · Assigned by GitHub_M
CVE-2026-45771Freeswitch Denial-of-Service in SIP PUBLISH Requests via XML Entity Expansion
High 7.5
In plain English
A high-severity security flaw in freeswitch from signalwire. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
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 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| signalwire | freeswitch | < 1.11.0 |
Weakness: CWE-776 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/signalwire/freeswitch/security/advisories/GHSA-5vjg-pv56-vg4c x_refsource_CONFIRM
- https://github.com/signalwire/freeswitch/releases/tag/v1.11.0 x_refsource_MISC