---
id: CVE-2026-116573
title: >-
  FreeSWITCH mod_sofia: stack buffer overflow from an over-long SIP To-header
  user
summary: "FreeSWITCH is an open-source software telecommunications platform. From 1.10.0 until 1.11.1, a stack-based buffer overflow in \_mod_sofia\_ when generating dialog-event notifications. A peer can establish a dialog with an excessively long …"
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-121
  - CWE-787
vendor: signalwire
product: freeswitch
affected:
  - freeswitch < 1.11.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:07:44.728371Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:07:54.785Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116573'
references:
  - url: >-
      https://github.com/signalwire/freeswitch/security/advisories/GHSA-6368-jw63-r8g2
    label: >-
      https://github.com/signalwire/freeswitch/security/advisories/GHSA-6368-jw63-r8g2
  - url: >-
      https://github.com/signalwire/freeswitch/commit/49f39c074a5bf81c754619e37ec9e39f2407101f
    label: >-
      https://github.com/signalwire/freeswitch/commit/49f39c074a5bf81c754619e37ec9e39f2407101f
  - url: 'https://github.com/signalwire/freeswitch/releases/tag/v1.11.2'
    label: 'https://github.com/signalwire/freeswitch/releases/tag/v1.11.2'
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.985Z'
---

## Overview

FreeSWITCH is an open-source software telecommunications platform. From 1.10.0 until 1.11.1, a stack-based buffer overflow in  mod_sofia  when generating dialog-event notifications. A peer can establish a dialog with an excessively long SIP To-header user part and subsequently subscribe to that entity’s dialog events, causing the stored value to overflow a fixed-size stack buffer. Exploitation requires presence or shared-appearance management to be enabled and normally requires valid profile credentials, unless subscription authentication is disabled. The overflow can terminate the FreeSWITCH process and all active calls. This vulnerability is fixed in version 1.11.2.

## Affected

- `freeswitch < 1.11.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.