CVE-2026-116779: SignalWire FreeSwitch Code Injection Vulnerability

Vulnerability summary

CVE-2026-116779 is a critical (CVSS 9.8) vulnerability in SignalWire FreeSwitch. It is known to be exploited: CISA lists it, first on 09-11-2026. EPSS estimates a 2.18% chance of exploitation in the next 30 days, higher than 82.4% of scored vulnerabilities.

Timeline

1. 05-11-2026
   PublishedVulnerability first disclosed.
2. 09-11-2026
   Added to CISA KEVExploitedSignalWire FreeSwitch Code Injection Vulnerability
3. 10-11-2026
   Last modifiedVulnerability information updated.
4. 12-11-2026
   CISA remediation dueUpcomingApply mitigations per vendor instructions.

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 1.11.3, sofia_presence_handle_sip_i_message() split the To user of an inbound SIP MESSAGE on a plus sign and treated the left side as a chat protocol selector. Selecting the api chat proto reached switch_api_execute(), allowing a peer whose MESSAGE was accepted to run FreeSWITCH API commands, including operating-system command sinks, with the daemon's privileges. Inbound chat is enabled on the stock internal and external profiles, and any authenticated profile account is sufficient; stock directory users without password material can also remove that barrier in affected configurations. The flaw permits configuration and credential disclosure, arbitrary call control, and command execution, and exploitation has been observed in the wild. This issue is fixed in version 1.11.3.

• CWE-77Improper Neutralization of Special Elements used in a CommandThe product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
• CWE-78Improper Neutralization of Special Elements used in an OS CommandThe product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.
• CWE-749Exposed Dangerous Method or FunctionThe product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted.