CVE WatchJul 20, 2026

CVE-2026-45771

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implement

CVSS

7.5

High

EPSS

0.3%

p27

KEV

—

Exploit Today

0-100

Published: Jun 9, 2026 · Last modified: Jul 20, 2026 · CWE-776

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-06-302026-07-22

Technical 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.

Official references

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