Bug 2567822 (CVE-2026-116573)

Summary: CVE-2026-116573 freeswitch: freeswitch: Denial of Service via stack-based buffer overflow in mod_sofia
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in FreeSWITCH. A stack-based buffer overflow vulnerability exists in the mod_sofia module when generating dialog-event notifications. An authenticated remote attacker can exploit this issue by establishing a dialog with an excessively long Session Initiation Protocol (SIP) header and subscribing to its dialog events. This causes an internal buffer overflow, terminating the FreeSWITCH process and resulting in a Denial of Service (DoS) that disconnects all active calls.
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Description OSIDB Bzimport 2026-11-05 22:28:56 UTC 
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.