CVE-2021-4235

2022-12-2700:00:00

ubuntu.com

yaml

denial of service

system resources

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS

0.001

Percentile

28.9%

JSON

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.

Notes

Author	Note
leosilva	kubernates is in fact a kubernetes installer that calls snap, not the package it self.

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchgolang-github-coreos-discovery-etcd-io< anyUNKNOWN
ubuntu22.04noarchgolang-github-coreos-discovery-etcd-io< anyUNKNOWN
ubuntu24.04noarchgolang-github-coreos-discovery-etcd-io< anyUNKNOWN
ubuntu18.04noarchgolang-yaml.v2< 0.0+git20170407.0.cd8b52f-1ubuntu2+esm1UNKNOWN
ubuntu20.04noarchgolang-yaml.v2< 2.2.2-1ubuntu0.1UNKNOWN
ubuntu16.04noarchgolang-yaml.v2< 0.0+git20160301.0.a83829b-1ubuntu0.1~esm1UNKNOWN
ubuntu20.04noarchkubernetes< anyUNKNOWN
ubuntu22.04noarchkubernetes< anyUNKNOWN
ubuntu24.04noarchkubernetes< anyUNKNOWN
ubuntu18.04noarchsingularity-container< anyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	golang-github-coreos-discovery-etcd-io	< any	UNKNOWN
ubuntu	22.04	noarch	golang-github-coreos-discovery-etcd-io	< any	UNKNOWN
ubuntu	24.04	noarch	golang-github-coreos-discovery-etcd-io	< any	UNKNOWN
ubuntu	18.04	noarch	golang-yaml.v2	< 0.0+git20170407.0.cd8b52f-1ubuntu2+esm1	UNKNOWN
ubuntu	20.04	noarch	golang-yaml.v2	< 2.2.2-1ubuntu0.1	UNKNOWN
ubuntu	16.04	noarch	golang-yaml.v2	< 0.0+git20160301.0.a83829b-1ubuntu0.1~esm1	UNKNOWN
ubuntu	20.04	noarch	kubernetes	< any	UNKNOWN
ubuntu	22.04	noarch	kubernetes	< any	UNKNOWN
ubuntu	24.04	noarch	kubernetes	< any	UNKNOWN
ubuntu	18.04	noarch	singularity-container	< any	UNKNOWN