HighFix available
coturn — security advisory
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.
- Products
- coturn
- Affected versions
- 4.12.0-1, 4.14.0-1, 4.15.0-1, 4.18.0-1, 4.6.1-1, 4.6.1-2
- Fixed versions
- 4.18.0-1
- CVEs
- CVE-2026-73214
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 29 Oct 2026, 13:52 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2026-73214
coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
coturn
Fixed versions: 4.18.0-1
Complete source record
{
"id": "86696e87168167616931fe9834b90084c080b1e1cf663553e27592f900d5b4ac",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-73214",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-73214",
"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.",
"evidence": "osv:DEBIAN-CVE-2026-73214",
"products": [
{
"name": {
"value": "coturn",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.12.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.14.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.15.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.18.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.1-2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "coturn",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.12.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.14.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.15.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.18.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.6.1-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "coturn",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.18.0-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "4.12.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.14.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.15.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.6.1-2",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-73214",
"aliases": [
"DEBIAN-CVE-2026-73214"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "coturn",
"purl": "pkg:deb/debian/coturn?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.12.0-1",
"4.14.0-1",
"4.15.0-1",
"4.18.0-1",
"4.6.1-1",
"4.6.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73214.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "coturn",
"purl": "pkg:deb/debian/coturn?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.12.0-1",
"4.14.0-1",
"4.15.0-1",
"4.18.0-1",
"4.6.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73214.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-1"
}
]
}
],
"package": {
"name": "coturn",
"purl": "pkg:deb/debian/coturn?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.12.0-1",
"4.14.0-1",
"4.15.0-1",
"4.6.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73214.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-10T16:00:08.864602016Z",
"provider": "osv",
"upstream": [
"CVE-2026-73214"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-73214"
]
},
"related_cves": [
{
"value": "CVE-2026-73214",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 250483,
"published_at": "2026-08-11T18:18:26.773+00:00"
}