Buffer overflow in Signalwire Freeswitch
CVE-2026-116573
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Signalwire Freeswitch — versions < 1.11.2
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-116573?
- CVE-2026-116573 is a medium-severity vulnerability in Signalwire Freeswitch, classified under Stack-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-11-05.
- How severe is CVE-2026-116573?
- Medium severity. CVSS v3 base score is 6.5 out of 10.