UBUNTU-CVE-2026-65981

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Source
https://ubuntu.com/security/CVE-2026-65981
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65981.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-65981
Upstream
Published
2026-07-31T21:17:00Z
Modified
2026-08-06T00:23:22Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, a server using --mobility authenticates a resumed REFRESH request with the resuming user's credentials but does not verify that identity against the original allocation owner, allowing an authenticated attacker who obtains a victim MOBILITY-TICKET to receive and inject relayed traffic and consume the victim's quota. In the handleturnrefresh resume branch, the victim allocation (origss) is located solely by the attacker-controlled mobile id, and credentials are only adopted (via copyauthparameters) when the resuming session is unauthenticated. Because the attacker's session already has hmackeyset set to 1 from its own prior authentication (which is never reset for long-term-credential sessions), the credential copy is skipped and checkstunauth validates the REFRESH against the attacker's own identity rather than the allocation owner's. This issue is fixed in version 4.15.0.

References

Affected packages

Ubuntu:16.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
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_version": "4.5.0.3-1ubuntu0.4",
            "binary_name": "coturn"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65981.json"
Ubuntu:18.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.5.0.7-1ubuntu2.18.04.3",
            "binary_name": "coturn"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65981.json"
Ubuntu:20.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
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_version": "4.5.1.1-1.1ubuntu0.20.04.2",
            "binary_name": "coturn"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65981.json"
Ubuntu:22.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.5.2-3
4.5.2-3.1~ubuntu22.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.5.2-3.1~ubuntu22.04.1",
            "binary_name": "coturn"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65981.json"
Ubuntu:24.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.6.1-1build1
4.6.1-1build2
4.6.1-1build3
4.6.1-1build4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.6.1-1build4",
            "binary_name": "coturn"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65981.json"
Ubuntu:26.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.6.1-2build1
4.6.1-2build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.6.1-2build2",
            "binary_name": "coturn"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65981.json"