High
coturn — security advisory
Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.
- Products
- coturn
- Affected versions
- 4.12.0-1, 4.14.0-1, 4.15.0-1, 4.18.0-1, 4.4.5.4-2, 4.5.0.2-3, 4.5.0.3-1, 4.5.0.3-1build1, 4.5.0.3-1ubuntu0.2, 4.5.0.3-1ubuntu0.3, 4.5.0.3-1ubuntu0.4, 4.5.0.6-1ubuntu2, 4.5.0.7-1ubuntu1, 4.5.0.7-1ubuntu2, 4.5.0.7-1ubuntu2.18.04.1, 4.5.0.7-1ubuntu2.18.04.2, 4.5.0.7-1ubuntu2.18.04.3, 4.5.1.1-1.1build1, 4.5.1.1-1.1build2, 4.5.1.1-1.1ubuntu0.20.04.1, 4.5.1.1-1.1ubuntu0.20.04.2, 4.5.2-3, 4.5.2-3.1~ubuntu22.04.1, 4.6.1-1build1, 4.6.1-1build2, 4.6.1-1build3, 4.6.1-1build4, 4.6.1-2build1, 4.6.1-2build2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-62959
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:11 UTC · Revision 1
Source evidence
Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.
osv:UBUNTU-CVE-2026-62959
coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
Complete source record
{
"id": "2215c57bbfec01fbd97312104e955a81a60f21fd244116eb1fe17a3cae523351",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-62959",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-62959",
"summary": "Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.",
"evidence": "osv:UBUNTU-CVE-2026-62959",
"products": [
{
"name": {
"value": "coturn",
"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "4.4.5.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.0.2-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.0.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.0.3-1build1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "4.5.0.3-1ubuntu0.3",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
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{
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},
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"affected_versions": [
{
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"evidence": "/affected/2/versions"
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{
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{
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"evidence": "/affected/2/versions"
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{
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{
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},
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
},
{
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"evidence": "/affected/3/versions"
}
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{
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"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
},
{
"value": "4.6.1-1build3",
"evidence": "/affected/4/versions"
},
{
"value": "4.6.1-1build4",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "coturn",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.6.1-2build2",
"evidence": "/affected/5/versions"
},
{
"value": "4.12.0-1",
"evidence": "/affected/5/versions"
},
{
"value": "4.14.0-1",
"evidence": "/affected/5/versions"
},
{
"value": "4.15.0-1",
"evidence": "/affected/5/versions"
},
{
"value": "4.18.0-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "4.6.1-2build1",
"evidence": "/affected/6/versions"
},
{
"value": "4.6.1-2build2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-62959",
"aliases": [
"UBUNTU-CVE-2026-62959"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"4.4.5.4-2",
"4.5.0.2-3",
"4.5.0.3-1",
"4.5.0.3-1build1",
"4.5.0.3-1ubuntu0.2",
"4.5.0.3-1ubuntu0.3",
"4.5.0.3-1ubuntu0.4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62959.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.5.0.3-1ubuntu0.4"
}
]
}
},
{
"ranges": [
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}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/coturn?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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"4.5.0.7-1ubuntu1",
"4.5.0.7-1ubuntu2",
"4.5.0.7-1ubuntu2.18.04.1",
"4.5.0.7-1ubuntu2.18.04.2",
"4.5.0.7-1ubuntu2.18.04.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62959.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.5.0.7-1ubuntu2.18.04.3"
}
]
}
},
{
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}
]
}
],
"package": {
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"ecosystem": "Ubuntu:20.04:LTS"
},
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"4.5.1.1-1.1build1",
"4.5.1.1-1.1build2",
"4.5.1.1-1.1ubuntu0.20.04.1",
"4.5.1.1-1.1ubuntu0.20.04.2"
],
"database_specific": {
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},
"ecosystem_specific": {
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}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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],
"package": {
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"4.5.2-3",
"4.5.2-3.1~ubuntu22.04.1"
],
"database_specific": {
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},
"ecosystem_specific": {
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],
"modified": "2026-10-17T13:00:30.975596321Z",
"provider": "osv",
"upstream": [
"CVE-2026-62959"
],
"references": [
"https://ubuntu.com/security/CVE-2026-62959",
"https://www.cve.org/CVERecord?id=CVE-2026-62959",
"https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g",
"https://github.com/coturn/coturn/pull/1965",
"https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4",
"https://github.com/coturn/coturn/releases/tag/4.15.0"
]
},
"related_cves": [
{
"value": "CVE-2026-62959",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360634,
"published_at": "2026-07-31T20:16:00+00:00"
}