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Vulnerability record · CVE-2026-116788 · published 5 November 2026

CVE-2026-116788: Freeswitch heap-based buffer overflow vulnerability

Freeswitch · Freeswitch

FreeSWITCH is an open-source software telecommunications platform. Before version 1.11.2, an integer underflow in  switch_xml_decode()  can cause an undersized heap allocation when an XML document declares an entity with an empty replacement value. Subsequent copying overruns the allocated buffer. An unauthenticated attacker who can reach a SIP profile with presence management enabled and DTD processing permitted can trigger the vulnerability through a crafted SIP PUBLISH request. Exploitation can corrupt heap memory and terminate the FreeSWITCH process, interrupting all active calls. This vulnerability is fixed in version 1.11.2.

8.2 CVSS 3.1 High EPSS 0.41% · top 64.4% CWE-122 · Heap-based buffer overflowCWE-131 · CWE-131
8.2CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
10 Nov 2026Last modified by NVD

Description

FreeSWITCH is an open-source software telecommunications platform. Before version 1.11.2, an integer underflow in  switch_xml_decode()  can cause an undersized heap allocation when an XML document declares an entity with an empty replacement value. Subsequent copying overruns the allocated buffer. An unauthenticated attacker who can reach a SIP profile with presence management enabled and DTD processing permitted can trigger the vulnerability through a crafted SIP PUBLISH request. Exploitation can corrupt heap memory and terminate the FreeSWITCH process, interrupting all active calls. This vulnerability is fixed in version 1.11.2.

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

Affected products

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

References

LinkTags
https://github.com/signalwire/freeswitch/commit/587474a1584488f0c04201e6e61efe76aa5bda01 Patch
https://github.com/signalwire/freeswitch/releases/tag/v1.11.2 Release Notes
https://github.com/signalwire/freeswitch/security/advisories/GHSA-f73w-xph4-pjp3 Vendor AdvisoryMitigation

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Related vulnerabilities

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

9.8CVE-2026-116779Freeswitch command injection vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…KEVEPSS 2.5%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 0.39%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-2026-116790Freeswitch authentication bypass by spoofing vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.34%9.1CVE-2026-116785Freeswitch 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 1.1%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 0.31%8.8CVE-2026-116786Freeswitch command injection vulnerabilityFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation tha…EPSS 0.45%8.2CVE-2026-116783Freeswitch 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 0.62%

Source: NIST National Vulnerability Database (record CVE-2026-116788), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.