UBUNTU-CVE-2026-27624

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Source
https://ubuntu.com/security/CVE-2026-27624
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27624.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-27624
Upstream
Published
2026-02-25T05:17:00Z
Modified
2026-03-02T12:12:51.450902Z
Severity
  • 7.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Coturn is a free open source implementation of TURN and STUN Server. Coturn is commonly configured to block loopback and internal ranges using "denied-peer-ip" and/or default loopback restrictions. CVE-2020-26262 addressed bypasses involving "0.0.0.0", "[::1]" and "[::]", but IPv4-mapped IPv6 is not covered. When sending a "CreatePermission" or "ChannelBind" request with the "XOR-PEER-ADDRESS" value of "::ffff:127.0.0.1", a successful response is received, even though "127.0.0.0/8" is blocked via "denied-peer-ip". The root cause is that, prior to the updated fix implemented in version 4.9.0, three functions in "src/client/nsturnioaddr.c" do not check "IN6ISADDRV4MAPPED". "ioaaddrisloopback()" checks "127.x.x.x" (AFINET) and "::1" (AFINET6), but not "::ffff:127.0.0.1." "ioaaddriszero()" checks "0.0.0.0" and "::", but not "::ffff:0.0.0.0." "addrlesseq()" used by "ioaaddrinrange()" for "denied-peer-ip" matching: when the range is AFINET and the peer is AFINET6, the comparison returns 0 without extracting the embedded IPv4. Version 4.9.0 contains an updated fix to address the bypass of the fix for CVE-2020-26262.

References

Affected packages

Ubuntu:16.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn@4.5.0.3-1ubuntu0.4?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-2026-27624.json"
Ubuntu:18.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn@4.5.0.7-1ubuntu2.18.04.3?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-2026-27624.json"
Ubuntu:20.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn@4.5.1.1-1.1ubuntu0.20.04.2?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-2026-27624.json"
Ubuntu:22.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn@4.5.2-3.1~ubuntu22.04.1?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-2026-27624.json"
Ubuntu:24.04:LTS
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn@4.6.1-1build4?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-2026-27624.json"
Ubuntu:25.10
coturn

Package

Name
coturn
Purl
pkg:deb/ubuntu/coturn@4.6.1-2build1?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*
4.6.1-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.6.1-2build1",
            "binary_name": "coturn"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27624.json"