Stack-based buffer overflow in freeswitch - CVE-2026-116573
Published: November 9, 2026
Vulnerability identifier: #VU162779
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-116573
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated remote attacker to crash the FreeSWITCH process and terminate every call on a stack-protected instance.
The vulnerability exists due to an unbounded copy of a stored To-header user into a stack buffer in mod_sofia when generating dialog notifications on SIP profiles with manage-presence or manage-shared-appearance enabled. An authenticated remote attacker can establish a dialog with an overlong To-header user and subscribe to its dialog events to trigger the overflow without victim interaction.
Affected software
freeswitch
How to mitigate CVE-2026-116573
Install security update from vendor's website.
freeswitch - update to 1.11.2