Resource exhaustion in freeswitch - CVE-2026-49842
Published: June 4, 2026
Vulnerability identifier: #VU133316
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-49842
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: www.freeswitch.org
Affected software:
freeswitch
freeswitch
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the mod_verto WebSocket frame loop when processing #SPU / #SPB / #SPE speed-test frames before authentication. A remote attacker can send a specially crafted WebSocket request with a large declared payload size to cause a denial of service.
The issue is reachable before the JSON-RPC dispatcher and authentication gate, and no user interaction is required.
How to mitigate CVE-2026-49842
Install security update from vendor's website.