Heap-based buffer overflow in freeswitch - CVE-2026-49841
Published: June 4, 2026
Vulnerability identifier: #VU133317
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-49841
CWE-ID: CWE-122
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 and potentially disclose sensitive information.
The vulnerability exists due to a heap-based buffer overflow in the mod_verto HTTP request handler when processing a crafted POST application/x-www-form-urlencoded body. A remote attacker can send a specially crafted HTTP request with an oversized Content-Length value to cause a denial of service and potentially disclose sensitive information.
The issue is reachable before the HTTP basic-auth check runs and affects only verto profiles with at least one vhost configured.
How to mitigate CVE-2026-49841
Install security update from vendor's website.