High [CVE-2026-73214] Denial of Service via unverified DTLS session state
This high-severity Red Hat Linux advisory covers CVE-2026-73214.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Summary
Coturn is a free open source implementation of TURN and STUN Server.
Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing.
This issue is fixed in version 4.16.0. 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. 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.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.
- < 4.16.0
Official advisory · high-confidence parse· fetched 30 days ago·verify at source
Mitigation checklist
- No action needed - the shipped coturn build (4.16.0) already contains the upstream fix.
Official advisory · high-confidence parse· fetched 30 days ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.