UBUNTU-CVE-2021-4235

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Source
https://ubuntu.com/security/CVE-2021-4235
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4235.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-4235
Upstream
Downstream
Related
Published
2022-12-27T22:15:00Z
Modified
2025-10-24T04:50:02Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Due to unbounded alias chasing, a maliciously crafted YAML file can cause the system to consume significant system resources. If parsing user input, this may be used as a denial of service vector.

References

Affected packages

Ubuntu:18.04:LTS

webhook

Package

Name
webhook
Purl
pkg:deb/ubuntu/webhook@2.5.0-2?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*

2.5.0-1
2.5.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.5.0-2",
            "binary_name": "webhook"
        }
    ]
}

Ubuntu:20.04:LTS

golang-yaml.v2

Package

Name
golang-yaml.v2
Purl
pkg:deb/ubuntu/golang-yaml.v2@2.2.2-1ubuntu0.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.2.2-1ubuntu0.1

Affected versions

2.*

2.2.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.2.2-1ubuntu0.1",
            "binary_name": "golang-gopkg-yaml.v2-dev"
        },
        {
            "binary_version": "2.2.2-1ubuntu0.1",
            "binary_name": "golang-yaml.v2-dev"
        }
    ],
    "availability": "No subscription required"
}

golang-github-coreos-discovery-etcd-io

Package

Name
golang-github-coreos-discovery-etcd-io
Purl
pkg:deb/ubuntu/golang-github-coreos-discovery-etcd-io@2.0.0+git2019.04.19.git.78fb45d3c9-1?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*

2.0.0+git2019.04.19.git.78fb45d3c9-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-1",
            "binary_name": "etcd-discovery"
        }
    ]
}

webhook

Package

Name
webhook
Purl
pkg:deb/ubuntu/webhook@2.6.9-1?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*

2.6.9-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.6.9-1",
            "binary_name": "webhook"
        }
    ]
}

Ubuntu:22.04:LTS

golang-github-coreos-discovery-etcd-io

Package

Name
golang-github-coreos-discovery-etcd-io
Purl
pkg:deb/ubuntu/golang-github-coreos-discovery-etcd-io@2.0.0+git2019.04.19.git.78fb45d3c9-4?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*

2.0.0+git2019.04.19.git.78fb45d3c9-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4",
            "binary_name": "etcd-discovery"
        }
    ]
}

webhook

Package

Name
webhook
Purl
pkg:deb/ubuntu/webhook@2.8.0-3ubuntu0.1?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*

2.6.9-1build2
2.8.0-3
2.8.0-3ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.8.0-3ubuntu0.1",
            "binary_name": "webhook"
        }
    ]
}

Ubuntu:24.04:LTS

golang-github-coreos-discovery-etcd-io

Package

Name
golang-github-coreos-discovery-etcd-io
Purl
pkg:deb/ubuntu/golang-github-coreos-discovery-etcd-io@2.0.0+git2019.04.19.git.78fb45d3c9-4ubuntu0.24.04.3?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*

2.0.0+git2019.04.19.git.78fb45d3c9-4build1
2.0.0+git2019.04.19.git.78fb45d3c9-4ubuntu0.24.04.1
2.0.0+git2019.04.19.git.78fb45d3c9-4ubuntu0.24.04.2
2.0.0+git2019.04.19.git.78fb45d3c9-4ubuntu0.24.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4ubuntu0.24.04.3",
            "binary_name": "etcd-discovery"
        }
    ]
}

webhook

Package

Name
webhook
Purl
pkg:deb/ubuntu/webhook@2.8.0-4ubuntu0.24.04.3?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*

2.8.0-4build1
2.8.0-4ubuntu0.24.04.1
2.8.0-4ubuntu0.24.04.2
2.8.0-4ubuntu0.24.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.8.0-4ubuntu0.24.04.3",
            "binary_name": "webhook"
        }
    ]
}

Ubuntu:25.04

golang-github-coreos-discovery-etcd-io

Package

Name
golang-github-coreos-discovery-etcd-io
Purl
pkg:deb/ubuntu/golang-github-coreos-discovery-etcd-io@2.0.0+git2019.04.19.git.78fb45d3c9-4build1?arch=source&distro=plucky

Affected ranges

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

Affected versions

2.*

2.0.0+git2019.04.19.git.78fb45d3c9-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4build1",
            "binary_name": "etcd-discovery"
        }
    ]
}

singularity-container

Package

Name
singularity-container
Purl
pkg:deb/ubuntu/singularity-container@4.1.5+ds4-1?arch=source&distro=plucky

Affected ranges

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

Affected versions

4.*

4.1.2+ds1-1
4.1.5+ds4-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.1.5+ds4-1",
            "binary_name": "golang-github-sylabs-singularity-dev"
        },
        {
            "binary_version": "4.1.5+ds4-1",
            "binary_name": "singularity-container"
        }
    ]
}

webhook

Package

Name
webhook
Purl
pkg:deb/ubuntu/webhook@2.8.0-4build1?arch=source&distro=plucky

Affected ranges

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

Affected versions

2.*

2.8.0-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.8.0-4build1",
            "binary_name": "webhook"
        }
    ]
}

Ubuntu:25.10

golang-github-coreos-discovery-etcd-io

Package

Name
golang-github-coreos-discovery-etcd-io
Purl
pkg:deb/ubuntu/golang-github-coreos-discovery-etcd-io@2.0.0+git2019.04.19.git.78fb45d3c9-4build1?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*

2.0.0+git2019.04.19.git.78fb45d3c9-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4build1",
            "binary_name": "etcd-discovery"
        }
    ]
}

singularity-container

Package

Name
singularity-container
Purl
pkg:deb/ubuntu/singularity-container@4.1.5+ds4-1?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*

4.1.5+ds4-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.1.5+ds4-1",
            "binary_name": "golang-github-sylabs-singularity-dev"
        },
        {
            "binary_version": "4.1.5+ds4-1",
            "binary_name": "singularity-container"
        }
    ]
}

webhook

Package

Name
webhook
Purl
pkg:deb/ubuntu/webhook@2.8.0-4build1?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*

2.8.0-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.8.0-4build1",
            "binary_name": "webhook"
        }
    ]
}

Ubuntu:Pro:16.04:LTS

golang-yaml.v2

Package

Name
golang-yaml.v2
Purl
pkg:deb/ubuntu/golang-yaml.v2@0.0+git20160301.0.a83829b-1ubuntu0.1~esm1?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.0+git20160301.0.a83829b-1ubuntu0.1~esm1

Affected versions

0.*

0.0+git20150627.7ad95dd-1
0.0+git20160301.0.a83829b-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.0+git20160301.0.a83829b-1ubuntu0.1~esm1",
            "binary_name": "golang-yaml.v2-dev"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:Pro:18.04:LTS

golang-yaml.v2

Package

Name
golang-yaml.v2
Purl
pkg:deb/ubuntu/golang-yaml.v2@0.0+git20170407.0.cd8b52f-1ubuntu2+esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.0+git20170407.0.cd8b52f-1ubuntu2+esm1

Affected versions

0.*

0.0+git20170407.0.cd8b52f-1ubuntu1
0.0+git20170407.0.cd8b52f-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.0+git20170407.0.cd8b52f-1ubuntu2+esm1",
            "binary_name": "golang-gopkg-yaml.v2-dev"
        },
        {
            "binary_version": "0.0+git20170407.0.cd8b52f-1ubuntu2+esm1",
            "binary_name": "golang-yaml.v2-dev"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

singularity-container

Package

Name
singularity-container
Purl
pkg:deb/ubuntu/singularity-container@2.4.2-4ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic

Affected ranges

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

Affected versions

2.*

2.3.1-2
2.3.2-1
2.4.1-1
2.4.2-2
2.4.2-3
2.4.2-4
2.4.2-4ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.4.2-4ubuntu0.1~esm1",
            "binary_name": "singularity-container"
        }
    ]
}

Ubuntu:Pro:24.04:LTS

singularity-container

Package

Name
singularity-container
Purl
pkg:deb/ubuntu/singularity-container@4.1.1+ds2-1ubuntu0.3+esm1?arch=source&distro=esm-apps/noble

Affected ranges

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

Affected versions

4.*

4.1.1+ds2-1
4.1.1+ds2-1build1
4.1.1+ds2-1ubuntu0.1
4.1.1+ds2-1ubuntu0.2
4.1.1+ds2-1ubuntu0.2+esm1
4.1.1+ds2-1ubuntu0.3
4.1.1+ds2-1ubuntu0.3+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.1.1+ds2-1ubuntu0.3+esm1",
            "binary_name": "golang-github-sylabs-singularity-dev"
        },
        {
            "binary_version": "4.1.1+ds2-1ubuntu0.3+esm1",
            "binary_name": "singularity-container"
        }
    ]
}