PT-2026-47848 · Signalwire · Freeswitch

Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-49841

Mitre

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, the mod verto HTTP request handler allocates a fixed 2 MiB buffer for a POST application/x-www-form-urlencoded body but accepts Content-Length up to just under 10 MiB. The body-read loop is bounded by Content-Length rather than the buffer size, producing an attacker-controlled heap overflow of up to ~8 MiB -- before the HTTP basic-auth check runs. This issue has been patched in version 1.11.1.

Fix

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

CWE-131

Related Identifiers

CVE-2026-49841

Affected Products

Freeswitch

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-49841 · Security Note
• https://github.com/signalwire/freeswitch/security/advisories/GHSA-wfrq-qvg2-f88f · Note
• https://github.com/signalwire/freeswitch/releases/tag/v1.11.1 · Note