ubuntu-cve-2021-4235
Vulnerability from osv_ubuntu
Published
2022-12-27 22:15
Modified
2026-05-20 14:53
Summary
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.
Severity
5.5 (Medium)
5.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "golang-yaml.v2-dev",
"binary_version": "0.0+git20160301.0.a83829b-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "golang-yaml.v2",
"purl": "pkg:deb/ubuntu/golang-yaml.v2@0.0+git20160301.0.a83829b-1ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.0+git20160301.0.a83829b-1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.0+git20150627.7ad95dd-1",
"0.0+git20160301.0.a83829b-1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "golang-gopkg-yaml.v2-dev",
"binary_version": "0.0+git20170407.0.cd8b52f-1ubuntu2+esm1"
},
{
"binary_name": "golang-yaml.v2-dev",
"binary_version": "0.0+git20170407.0.cd8b52f-1ubuntu2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "golang-yaml.v2",
"purl": "pkg:deb/ubuntu/golang-yaml.v2@0.0+git20170407.0.cd8b52f-1ubuntu2+esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.0+git20170407.0.cd8b52f-1ubuntu2+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.0+git20170407.0.cd8b52f-1ubuntu1",
"0.0+git20170407.0.cd8b52f-1ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "singularity-container",
"binary_version": "2.4.2-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "singularity-container",
"purl": "pkg:deb/ubuntu/singularity-container@2.4.2-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "webhook",
"binary_version": "2.5.0-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "webhook",
"purl": "pkg:deb/ubuntu/webhook@2.5.0-2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.5.0-1",
"2.5.0-2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "golang-gopkg-yaml.v2-dev",
"binary_version": "2.2.2-1ubuntu0.1"
},
{
"binary_name": "golang-yaml.v2-dev",
"binary_version": "2.2.2-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "golang-yaml.v2",
"purl": "pkg:deb/ubuntu/golang-yaml.v2@2.2.2-1ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.2.2-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-discovery",
"binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"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\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.0+git2019.04.19.git.78fb45d3c9-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "webhook",
"binary_version": "2.6.9-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "webhook",
"purl": "pkg:deb/ubuntu/webhook@2.6.9-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.6.9-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-discovery",
"binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"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\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.0+git2019.04.19.git.78fb45d3c9-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "webhook",
"binary_version": "2.8.0-3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "webhook",
"purl": "pkg:deb/ubuntu/webhook@2.8.0-3ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.6.9-1build2",
"2.8.0-3",
"2.8.0-3ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-discovery",
"binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4ubuntu0.24.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"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\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "webhook",
"binary_version": "2.8.0-4ubuntu0.24.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "webhook",
"purl": "pkg:deb/ubuntu/webhook@2.8.0-4ubuntu0.24.04.3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "golang-github-sylabs-singularity-dev",
"binary_version": "4.1.1+ds2-1ubuntu0.3+esm2"
},
{
"binary_name": "singularity-container",
"binary_version": "4.1.1+ds2-1ubuntu0.3+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "singularity-container",
"purl": "pkg:deb/ubuntu/singularity-container@4.1.1+ds2-1ubuntu0.3+esm2?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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",
"4.1.1+ds2-1ubuntu0.3+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-discovery",
"binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"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\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.0+git2019.04.19.git.78fb45d3c9-4build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-sylabs-singularity-dev",
"binary_version": "4.1.5+ds4-1"
},
{
"binary_name": "singularity-container",
"binary_version": "4.1.5+ds4-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "singularity-container",
"purl": "pkg:deb/ubuntu/singularity-container@4.1.5+ds4-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.1.5+ds4-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "webhook",
"binary_version": "2.8.0-4build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "webhook",
"purl": "pkg:deb/ubuntu/webhook@2.8.0-4build1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.8.0-4build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-discovery",
"binary_version": "2.0.0+git2019.04.19.git.78fb45d3c9-4build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "golang-github-coreos-discovery-etcd-io",
"purl": "pkg:deb/ubuntu/golang-github-coreos-discovery-etcd-io@2.0.0+git2019.04.19.git.78fb45d3c9-4build2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.0+git2019.04.19.git.78fb45d3c9-4build1",
"2.0.0+git2019.04.19.git.78fb45d3c9-4build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-sylabs-singularity-dev",
"binary_version": "4.1.5+ds4-1"
},
{
"binary_name": "singularity-container",
"binary_version": "4.1.5+ds4-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "singularity-container",
"purl": "pkg:deb/ubuntu/singularity-container@4.1.5+ds4-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.1.5+ds4-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "webhook",
"binary_version": "2.8.0-4build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "webhook",
"purl": "pkg:deb/ubuntu/webhook@2.8.0-4build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.8.0-4build1"
]
}
],
"aliases": [],
"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.",
"id": "UBUNTU-CVE-2021-4235",
"modified": "2026-05-20T14:53:02Z",
"published": "2022-12-27T22:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-4235"
},
{
"type": "REPORT",
"url": "https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241"
},
{
"type": "REPORT",
"url": "https://pkg.go.dev/vuln/GO-2021-0061"
},
{
"type": "REPORT",
"url": "https://github.com/go-yaml/yaml/pull/375"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6287-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-4235"
}
],
"related": [
"USN-6287-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-4235"
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…