TI-2026-85616 Aliases CVE-2026-116572

Stack buffer overflow in FreeSWITCH mod_sofia from long SIP display names

LOW 29CWE-121Published 2026-11-05 · Updated 2026-11-05

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

FreeSWITCH from 1.10.0 through 1.11.1 is affected. A stack-based buffer overflow in mod_sofia occurs when the platform processes an over-long SIP Contact display name for dialog-event notifications. A peer that establishes a dialog with an excessively long display name and then subscribes to its dialog events overflows a fixed 512-byte stack buffer, which requires presence management to be enabled and usually valid profile credentials unless subscription authentication is disabled. The overflow can terminate the FreeSWITCH process and all active calls.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00459 40th percentileScored 2026-11-07

Fix Fixed freeswitch (signalwire): 1.11.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
signalwire	freeswitch	before 1.11.2	1.11.2	Patch available	CNA

freeswitch Vendorsignalwire Affected before 1.11.2 Fixed in 1.11.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:freeswitch:freeswitch::::::::	—	—	freeswitch

cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:* Versions — — ·freeswitch

Remediation

Upgrade FreeSWITCH to version 1.11.2, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Fix · CNA freeswitch (signalwire) Fixed in 1.11.2

Timeline

2026-11-05 Threatist record created from CVE-2026-116572
2026-11-05 CISA SSVC decision points changed
2026-11-05 Priority changed: MEDIUM → LOW

References

Other 3

TI-2023-08915 heap-over-flow in stun_parse_attribute in sofia-sip CVSS 3.1CRITICAL 9.8
TI-2022-13049 Heap-based Buffer Overflow and Out-of-bounds Write in Sofia-SIP CVSS 3.1CRITICAL 9.8
TI-2023-28097 FreeSWITCH susceptible to Denial of Service via DTLS Hello packets during call initiation CVSS 3.1HIGH 7.5
TI-2023-20909 Resource allocation without limits in signalwire freeswitch CVSS 3.1HIGH 7.5
TI-2023-20908 FreeSWITCH allows remote users to trigger out of bounds write by offering an ICE candidate with unknown component ID CVSS 3.1HIGH 7.5
TI-2023-15601 heap-over-flow and integer-overflow in sofia-sip CVSS 3.1HIGH 7.5

See all 44 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences