Medium
coturn — security advisory
Coturn 4.10.0 contains an uninitialized memory disclosure vulnerability that allows remote unauthenticated attackers to leak stack memory contents by sending a TURN Allocate request without credentials. Attackers can exploit the stun_init_error_response_common_str() function in src/client/ns_turn_msg.c, which fails to zero-initialize the avalue buffer before computing its length with strlen() and copying leaked stack bytes into the ERROR-CODE reason phrase, exposing pointer fragments that weaken ASLR and enable precise version fingerprinting.
- Products
- coturn
- Affected 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, 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-2026-104074
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:01 UTC · Revision 1
Source evidence
Coturn 4.10.0 contains an uninitialized memory disclosure vulnerability that allows remote unauthenticated attackers to leak stack memory contents by sending a TURN Allocate request without credentials. Attackers can exploit the stun_init_error_response_common_str() function in src/client/ns_turn_msg.c, which fails to zero-initialize the avalue buffer before computing its length with strlen() and copying leaked stack bytes into the ERROR-CODE reason phrase, exposing pointer fragments that weaken ASLR and enable precise version fingerprinting.
osv:UBUNTU-CVE-2026-104074
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": "c7e30668971dbb4e6ec7cedaf1dd61a671f824bf7e2165d83cc37358977b463e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-104074",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-104074",
"summary": "Coturn 4.10.0 contains an uninitialized memory disclosure vulnerability that allows remote unauthenticated attackers to leak stack memory contents by sending a TURN Allocate request without credentials. Attackers can exploit the stun_init_error_response_common_str() function in src/client/ns_turn_msg.c, which fails to zero-initialize the avalue buffer before computing its length with strlen() and copying leaked stack bytes into the ERROR-CODE reason phrase, exposing pointer fragments that weaken ASLR and enable precise version fingerprinting.",
"evidence": "osv:UBUNTU-CVE-2026-104074",
"products": [
{
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},
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"evidence": "/affected/0/versions"
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{
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{
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{
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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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{
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"evidence": "/affected/2/versions"
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{
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{
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"evidence": "/affected/4/versions"
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{
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},
{
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"evidence": "/affected/4/versions"
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},
{
"name": {
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},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/5/versions"
},
{
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],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-104074",
"aliases": [
"UBUNTU-CVE-2026-104074"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/coturn?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
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"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-2026-104074.json"
},
"ecosystem_specific": {
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}
]
}
},
{
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],
"package": {
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"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",
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"4.5.0.7-1ubuntu2.18.04.3"
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"database_specific": {
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},
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],
"modified": "2026-10-17T10:01:19Z",
"provider": "osv",
"upstream": [
"CVE-2026-104074"
],
"references": [
"https://ubuntu.com/security/CVE-2026-104074",
"https://www.cve.org/CVERecord?id=CVE-2026-104074",
"https://github.com/coturn/coturn/pull/1878",
"https://github.com/coturn/coturn/commit/741b2983cc52f967dd08c438fd72a5f08f13ca27",
"https://github.com/coturn/coturn/releases/tag/4.11.0"
]
},
"related_cves": [
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"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 352299,
"published_at": "2026-10-07T15:17:00+00:00"
}