UBUNTU-CVE-2026-18726

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-18726
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18726
Upstream
  • CVE-2026-18726
Published
2026-08-12T22:17:00Z
Modified
2026-08-19T11:01:27Z
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. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed.

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.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_name": "iscsiuio",
            "binary_version": "2.0.874-7.1ubuntu6.5"
        },
        {
            "binary_name": "open-iscsi",
            "binary_version": "2.0.874-7.1ubuntu6.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.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_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",
            "binary_version": "2.1.5-1ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.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_name": "iscsiuio",
            "binary_version": "2.1.9-3ubuntu5.4"
        },
        {
            "binary_name": "libopeniscsiusr",
            "binary_version": "2.1.9-3ubuntu5.4"
        },
        {
            "binary_name": "open-iscsi",
            "binary_version": "2.1.9-3ubuntu5.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.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_name": "iscsiuio",
            "binary_version": "2.1.11-3ubuntu3"
        },
        {
            "binary_name": "libopeniscsiusr",
            "binary_version": "2.1.11-3ubuntu3"
        },
        {
            "binary_name": "open-iscsi",
            "binary_version": "2.1.11-3ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.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_name": "open-iscsi",
            "binary_version": "2.0.873+git0.3b4b4500-14ubuntu3.7+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.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_name": "iscsiuio",
            "binary_version": "2.0.874-5ubuntu2.11+esm1"
        },
        {
            "binary_name": "open-iscsi",
            "binary_version": "2.0.874-5ubuntu2.11+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"