---
id: CVE-2026-116568
title: 'FreeSWITCH: Out-of-bounds read in mod_rtmp H.264 video message parsing'
summary: >-
  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 1.11.2, rtmp_rtmp2rtpH264()
  trusted the lengt…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
  - CWE-191
vendor: signalwire
product: freeswitch
affected:
  - freeswitch < 1.11.2
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-05T21:12:02.376974Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:12:15.082Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116568'
references:
  - url: >-
      https://github.com/signalwire/freeswitch/security/advisories/GHSA-2gp7-f34j-j4xw
    label: >-
      https://github.com/signalwire/freeswitch/security/advisories/GHSA-2gp7-f34j-j4xw
  - url: >-
      https://github.com/signalwire/freeswitch/commit/72cda5bfad67d14d8dbe76b8f8bdd38c4fa5c932
    label: >-
      https://github.com/signalwire/freeswitch/commit/72cda5bfad67d14d8dbe76b8f8bdd38c4fa5c932
  - url: 'https://github.com/signalwire/freeswitch/releases/tag/v1.11.2'
    label: 'https://github.com/signalwire/freeswitch/releases/tag/v1.11.2'
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.997Z'
---

## Overview

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 1.11.2, rtmp_rtmp2rtpH264() trusted the length prefix of each inbound H.264 NAL unit without checking it against the bytes remaining in the RTMP message. An oversized declared unit underflowed the unsigned remaining-byte counter and advanced the parser beyond its receive buffer, where the next length-prefix read could crash the process. The flaw affects deployments that build and load mod_rtmp and accept video call sessions, commonly on TCP port 1935; placing the call requires a directory login where auth-calls is true, while no credentials are required where auth-calls is absent or false. A remote client can terminate FreeSWITCH and every active call, but the defect supplies no write primitive and memory disclosure has not been demonstrated. This issue is fixed in version 1.11.2.

## Affected

- `freeswitch < 1.11.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.