Heap-based buffer overflow in freeswitch - CVE-2026-116788
Published: November 9, 2026
Vulnerability identifier: #VU162793
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-116788
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to crash FreeSWITCH and cause denial of service.
The vulnerability exists due to a buffer size underflow in the core XML parser when decoding a DTD entity with an empty replacement value. An unauthenticated remote attacker can send a single SIP PUBLISH request containing crafted XML to a reachable profile with manage-presence enabled, triggering a heap buffer overflow before authentication.
Affected software
freeswitch
How to mitigate CVE-2026-116788
Install security update from vendor's website.
freeswitch - update to 1.11.2