UBUNTU-CVE-2026-18727

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-18727
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18727
Upstream
  • CVE-2026-18727
Published
2026-08-13T00:00:00Z
Modified
2026-08-13T19:30:08.610738026Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in open-iscsi's iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing. Specifically, crafted DHCPv6 Advertise traffic with a short User Datagram Protocol (UDP) length can cause the DHCPv6 payload length to underflow. An unauthenticated attacker on an adjacent network segment can exploit this by sending specially crafted IPv6 UDP traffic while the client is in an active DHCPv6 exchange, leading to a denial of service due to a process crash or service disruption.

References

Affected packages

Ubuntu:14.04:LTS
open-iscsi

Package

Name
open-iscsi
Purl
pkg:deb/ubuntu/open-iscsi?arch=source&distro=trusty

Affected ranges

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

Affected versions

2.*
2.0.873-3ubuntu7
2.0.873-3ubuntu8
2.0.873-3ubuntu9

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.873-3ubuntu9",
            "binary_name": "open-iscsi"
        },
        {
            "binary_version": "2.0.873-3ubuntu9",
            "binary_name": "open-iscsi-utils"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json"
Ubuntu:20.04:LTS
open-iscsi

Package

Name
open-iscsi
Purl
pkg:deb/ubuntu/open-iscsi?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.0.874-7.1ubuntu3
2.0.874-7.1ubuntu5
2.0.874-7.1ubuntu6
2.0.874-7.1ubuntu6.1
2.0.874-7.1ubuntu6.2
2.0.874-7.1ubuntu6.3
2.0.874-7.1ubuntu6.4
2.0.874-7.1ubuntu6.5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.874-7.1ubuntu6.5",
            "binary_name": "iscsiuio"
        },
        {
            "binary_version": "2.0.874-7.1ubuntu6.5",
            "binary_name": "open-iscsi"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json"
Ubuntu:22.04:LTS
open-iscsi

Package

Name
open-iscsi
Purl
pkg:deb/ubuntu/open-iscsi?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.1.4-0ubuntu1
2.1.4-0ubuntu2
2.1.4-0ubuntu3
2.1.4-0ubuntu4
2.1.5-1ubuntu1
2.1.5-1ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.5-1ubuntu1.1",
            "binary_name": "iscsiuio"
        },
        {
            "binary_version": "2.1.5-1ubuntu1.1",
            "binary_name": "libopeniscsiusr"
        },
        {
            "binary_version": "2.1.5-1ubuntu1.1",
            "binary_name": "libopeniscsiusr0.2.0"
        },
        {
            "binary_version": "2.1.5-1ubuntu1.1",
            "binary_name": "open-iscsi"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json"
Ubuntu:24.04:LTS
open-iscsi

Package

Name
open-iscsi
Purl
pkg:deb/ubuntu/open-iscsi?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.1.8-1ubuntu2
2.1.9-3ubuntu1
2.1.9-3ubuntu2
2.1.9-3ubuntu3
2.1.9-3ubuntu4
2.1.9-3ubuntu5.1
2.1.9-3ubuntu5.2
2.1.9-3ubuntu5.3
2.1.9-3ubuntu5.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.9-3ubuntu5.4",
            "binary_name": "iscsiuio"
        },
        {
            "binary_version": "2.1.9-3ubuntu5.4",
            "binary_name": "libopeniscsiusr"
        },
        {
            "binary_version": "2.1.9-3ubuntu5.4",
            "binary_name": "open-iscsi"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json"
Ubuntu:26.04:LTS
open-iscsi

Package

Name
open-iscsi
Purl
pkg:deb/ubuntu/open-iscsi?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.1.11-1ubuntu3
2.1.11-3ubuntu1
2.1.11-3ubuntu2
2.1.11-3ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.11-3ubuntu3",
            "binary_name": "iscsiuio"
        },
        {
            "binary_version": "2.1.11-3ubuntu3",
            "binary_name": "libopeniscsiusr"
        },
        {
            "binary_version": "2.1.11-3ubuntu3",
            "binary_name": "open-iscsi"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json"
Ubuntu:Pro:16.04:LTS
open-iscsi

Package

Name
open-iscsi
Purl
pkg:deb/ubuntu/open-iscsi?arch=source&distro=esm-infra%2Fxenial

Affected ranges

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

Affected versions

2.*
2.0.873-3ubuntu13
2.0.873+git0.3b4b4500-13ubuntu3
2.0.873+git0.3b4b4500-14ubuntu1
2.0.873+git0.3b4b4500-14ubuntu3
2.0.873+git0.3b4b4500-14ubuntu3.1
2.0.873+git0.3b4b4500-14ubuntu3.2
2.0.873+git0.3b4b4500-14ubuntu3.3
2.0.873+git0.3b4b4500-14ubuntu3.4
2.0.873+git0.3b4b4500-14ubuntu3.5
2.0.873+git0.3b4b4500-14ubuntu3.6
2.0.873+git0.3b4b4500-14ubuntu3.7
2.0.873+git0.3b4b4500-14ubuntu3.7+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.873+git0.3b4b4500-14ubuntu3.7+esm1",
            "binary_name": "open-iscsi"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json"
Ubuntu:Pro:18.04:LTS
open-iscsi

Package

Name
open-iscsi
Purl
pkg:deb/ubuntu/open-iscsi?arch=source&distro=esm-infra%2Fbionic

Affected ranges

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

Affected versions

2.*
2.0.874-4ubuntu3
2.0.874-4ubuntu4
2.0.874-4ubuntu5
2.0.874-5ubuntu1
2.0.874-5ubuntu2
2.0.874-5ubuntu2.1
2.0.874-5ubuntu2.2
2.0.874-5ubuntu2.3
2.0.874-5ubuntu2.4
2.0.874-5ubuntu2.6
2.0.874-5ubuntu2.7
2.0.874-5ubuntu2.9
2.0.874-5ubuntu2.10
2.0.874-5ubuntu2.11
2.0.874-5ubuntu2.11+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.874-5ubuntu2.11+esm1",
            "binary_name": "iscsiuio"
        },
        {
            "binary_version": "2.0.874-5ubuntu2.11+esm1",
            "binary_name": "open-iscsi"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18727.json"