coturn: mobility disconnects bypass allocation quotas and exhaust relay capacity (CVE-2026-73216) | HOL Guard CVE

Medium · CVSS 6.5CVE-2026-73216

coturn: mobility disconnects bypass allocation quotas and exhaust relay capacity

Answer in brief

CVE-2026-73216 records a Medium severity (CVSS 6.5) vulnerability in coturn: mobility disconnects bypass allocation quotas and exhaust relay capacity. The current sources do not mark it as known exploited. The current feed maps coturn/coturn (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 11, 2026Updated Sep 9, 2026Source checked Sep 25, 2026First seen by HOL Aug 11, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps coturn/coturn (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
coturn/coturngeneric	< 4.17.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for coturn/coturn.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source description

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.

Quoted source text, attributed separately from HOL analysis.