CVE-2026-73214
Description
A flaw was found in coturn. This vulnerability allows an unauthenticated remote attacker to cause a Denial of Service (DoS) by sending specially crafted fragmented ClientHello messages. The coturn server retains OpenSSL Datagram Transport Layer Security (DTLS) session state for these messages before validating the DTLS cookie, leading to excessive memory consumption and resource exhaustion.
Statement
This flaw affects the community-maintained coturn TURN/STUN server as shipped in Fedora and EPEL. Red Hat does not ship coturn in any core Red Hat product. Fedora and EPEL currently ship coturn 4.16.0 which already includes the fix.
Mitigation
No action needed - the shipped coturn build (4.16.0) already contains the upstream fix.
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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