UBUNTU-CVE-2026-68553 (CVE-2026-68553)
Vulnerability from osv_ubuntu – Published: 2026-08-19 21:17 – Updated: 2026-09-02 16:23 – Source website
VLAI
Details
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes is_secure_string() validation and is embedded into Redis keys at nine call sites in src/apps/relay/ns_ioalib_engine_impl.c. send_message_to_redis() in src/apps/relay/hiredis_libevent2.c then passes the attacker-controlled key as the format argument to redisAsyncCommand() while supplying only one variadic value, causing hiredis redisvFormatCommand() to read past the va_list. Exploitation can crash the coturn process and terminate active TURN sessions or disclose stack memory into Redis. This issue is fixed in version 4.13.0.
Severity
7.1 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.5.0.3-1ubuntu0.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn@4.5.0.3-1ubuntu0.4?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.5.0.7-1ubuntu2.18.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn@4.5.0.7-1ubuntu2.18.04.3?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.5.1.1-1.1ubuntu0.20.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn@4.5.1.1-1.1ubuntu0.20.04.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.5.2-3.1~ubuntu22.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn@4.5.2-3.1~ubuntu22.04.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.5.2-3",
"4.5.2-3.1~ubuntu22.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.6.1-1build4"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn@4.6.1-1build4?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.6.1-1build1",
"4.6.1-1build2",
"4.6.1-1build3",
"4.6.1-1build4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "coturn",
"binary_version": "4.6.1-2build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "coturn",
"purl": "pkg:deb/ubuntu/coturn@4.6.1-2build2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.6.1-2build1",
"4.6.1-2build2"
]
}
],
"aliases": [],
"details": "Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes is_secure_string() validation and is embedded into Redis keys at nine call sites in src/apps/relay/ns_ioalib_engine_impl.c. send_message_to_redis() in src/apps/relay/hiredis_libevent2.c then passes the attacker-controlled key as the format argument to redisAsyncCommand() while supplying only one variadic value, causing hiredis redisvFormatCommand() to read past the va_list. Exploitation can crash the coturn process and terminate active TURN sessions or disclose stack memory into Redis. This issue is fixed in version 4.13.0.",
"id": "UBUNTU-CVE-2026-68553",
"modified": "2026-09-02T16:23:49Z",
"published": "2026-08-19T21:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-68553"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-68553"
},
{
"type": "REPORT",
"url": "https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979"
},
{
"type": "REPORT",
"url": "https://github.com/coturn/coturn/releases/tag/4.13.0"
},
{
"type": "REPORT",
"url": "https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-68553"
]
}
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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