High
coturn — security advisory
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.
- 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-2026-40613
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:10 UTC · Revision 1
Source evidence
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.
osv:UBUNTU-CVE-2026-40613
coturn
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coturn
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coturn
Fixed versions: Not specified
coturn
Fixed versions: Not specified
coturn
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coturn
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coturn
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coturn
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Complete source record
{
"id": "4b12b18d86d335e1ee06d292619d0f7175fb7dabda9453e4312ee183362e9e5f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-40613",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-40613",
"summary": "Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.",
"evidence": "osv:UBUNTU-CVE-2026-40613",
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{
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{
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{
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{
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"severity": "high",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
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],
"modified": "2026-10-17T12:58:14.148173790Z",
"provider": "osv",
"upstream": [
"CVE-2026-40613"
],
"references": [
"https://ubuntu.com/security/CVE-2026-40613",
"https://www.cve.org/CVERecord?id=CVE-2026-40613",
"https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36"
]
},
"related_cves": [
{
"value": "CVE-2026-40613",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358399,
"published_at": "2026-04-21T19:16:00+00:00"
}