Out-of-bounds read in freeswitch - CVE-2026-116568
Published: November 9, 2026
Vulnerability identifier: #VU162783
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-116568
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to crash FreeSWITCH and terminate every active call when mod_rtmp is built and loaded and auth-calls is disabled.
The vulnerability exists due to unchecked NAL unit lengths in RTMP H.264 video parsing, causing an out-of-bounds read. An unauthenticated remote attacker can establish a video call and send a malformed video message to trigger the crash, although profiles enabling auth-calls require directory user credentials first.
Affected software
freeswitch
How to mitigate CVE-2026-116568
Install security update from vendor's website.
freeswitch - update to 1.11.2