CVE-2026-116572: FreeSWITCH mod_sofia: stack buffer overflow from an over-long SIP Contact display-name

Vulnerability summary

CVE-2026-116572 is a medium (CVSS 6.5) Stack-based Buffer Overflow vulnerability in signalwire freeswitch. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 40% of scored vulnerabilities.

Timeline

1. 05-11-2026
   PublishedVulnerability first disclosed.
2. 05-11-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-121Stack-based Buffer OverflowThe product writes past the end of a buffer that was allocated on the stack.
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.