Bug 2567873 (CVE-2026-116572)

Summary: CVE-2026-116572 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 remote authenticated attacker can cause a Denial of Service (DoS) by triggering a stack-based buffer overflow in the mod_sofia module. By establishing a Session Initiation Protocol (SIP) dialog with an excessively long Contact display name and subscribing to its dialog events, the stored value overflows an internal memory buffer. In configurations with presence management enabled, this issue crashes the application and terminates all active calls.
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Description OSIDB Bzimport 2026-11-05 22:32:53 UTC 
FreeSWITCH is an open-source software telecommunications platform. From 1.10.0 to 1.11.1, there is a stack-based buffer overflow in  mod_sofia  when processing SIP Contact display names for dialog-event notifications. A peer can establish a dialog containing an excessively long display name and subsequently subscribe to that entity’s dialog events, causing the stored value to overflow a fixed 512-byte stack buffer. Exploitation requires presence management to be enabled, directly or through shared appearance, 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.