---
id: CVE-2026-73213
title: Coturn is a free open source implementation of TURN and STUN Server
summary: >-
  Coturn is a free open source implementation of TURN and STUN Server. Prior to
  4.16.0, addr_less_eq() in src/client/ns_turn_ioaddr.c uses a component-wise
  comparison for native IPv6 min-max intervals in ioa_addr_in_range(), allowing
  an au…
severity: none
cwe:
  - CWE-863
published: '2026-08-11'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:55:04.493'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73213'
references:
  - url: >-
      https://github.com/coturn/coturn/commit/6c13608c28a04af5d63abddd7565a0dcc4771c28
    label: security-advisories@github.com
  - url: 'https://github.com/coturn/coturn/releases/tag/4.16.0'
    label: security-advisories@github.com
  - url: 'https://github.com/coturn/coturn/security/advisories/GHSA-4v97-rxjj-4f99'
    label: security-advisories@github.com
  - url: 'https://github.com/coturn/coturn/security/advisories/GHSA-4v97-rxjj-4f99'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00414
epssPercentile: 0.32872
ingestedAt: '2026-09-09T21:22:45.529Z'
---

## Overview

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addr_less_eq() in src/client/ns_turn_ioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioa_addr_in_range(), allowing an authenticated TURN client to relay to an IPv6 peer that is numerically within a configured non-prefix-aligned denied-peer-ip range but is classified as outside it. This issue is fixed in version 4.16.0.

## Remediation

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