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Vulnerability record · CVE-2026-45771 · published 9 June 2026

CVE-2026-45771: Freeswitch vulnerability

Freeswitch · Freeswitch

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.

7.5 CVSS 3.1 High EPSS 0.49% · top 60.5% CWE-776 · CWE-776
7.5CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
20 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/signalwire/freeswitch/releases/tag/v1.11.0 ProductRelease Notes
https://github.com/signalwire/freeswitch/security/advisories/GHSA-5vjg-pv56-vg4c MitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-49841Freeswitch heap-based buffer overflow vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.61%9.8CVE-2019-19492Freeswitch hard-coded credentials vulnerabilityFreeSWITCH 1.6.10 through 1.10.1 has a default password in event_socket.conf.xml.EPSS 29%9.1CVE-2026-49840Freeswitch improper input validation vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.49%7.5CVE-2026-49842Freeswitch uncontrolled resource consumption vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.58%7.5CVE-2026-49847Freeswitch vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.53%7.5CVE-2026-49475Freeswitch improper input validation vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.49%7.5CVE-2023-40018Freeswitch out-of-bounds write vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.99%7.5CVE-2021-41158Freeswitch information exposure vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.83%

Source: NIST National Vulnerability Database (record CVE-2026-45771), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.