medium
5.5
CWE
400
Advisory Published
CVE Published
Updated

CVE-2021-4235: Denial of service in gopkg.in/yaml.v2

First published: Tue Dec 27 2022(Updated: )

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.

Credit: security@golang.org security@golang.org

Affected SoftwareAffected VersionHow to fix
redhat/openshift-clients<0:4.12.0-202301042257.p0.g854f807.assembly.stream.el9
0:4.12.0-202301042257.p0.g854f807.assembly.stream.el9
ubuntu/golang-yaml.v2<0.0+
0.0+
ubuntu/golang-yaml.v2<2.2.2-1ubuntu0.1
2.2.2-1ubuntu0.1
ubuntu/golang-yaml.v2<2.2.3
2.2.3
ubuntu/golang-yaml.v2<0.0+
0.0+
<2.2.3
Yaml Project Yaml<2.2.3
redhat/go-yaml<2.2.3
2.2.3
debian/golang-yaml.v2<=2.2.2-1
2.2.2-1+deb10u1
2.4.0-1
2.4.0-4

Remedy

https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241

Remedy

https://github.com/go-yaml/yaml/pull/375

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-4235?

    CVE-2021-4235 is a vulnerability caused by unbounded alias chasing in go-yaml, allowing a maliciously crafted YAML file to consume significant system resources and potentially be used as a denial of service vector.

  • How does CVE-2021-4235 impact the system?

    CVE-2021-4235 can lead to excessive consumption of system resources when parsing user input, potentially causing a denial of service.

  • What software versions are affected by CVE-2021-4235?

    The affected software versions include golang-yaml.v2 0.0+ (Ubuntu Bionic), golang-yaml.v2 2.2.2-1ubuntu0.1 (Ubuntu Focal), golang-yaml.v2 2.2.3 (Ubuntu upstream), golang-yaml.v2 0.0+ (Ubuntu Xenial), golang-yaml.v2 2.2.2-1+deb10u1, 2.4.0-1, 2.4.0-4 (Debian), go-yaml 2.2.3 (Red Hat), and openshift-clients 0:4.12.0-202301042257.p0.g854f807.assembly.stream.el9 (Red Hat).

  • What is the severity of CVE-2021-4235?

    CVE-2021-4235 has a severity level of medium with a CVSS score of 5.5.

  • How can CVE-2021-4235 be fixed?

    To fix CVE-2021-4235, it is recommended to update the affected software to the latest secure version provided by the respective vendors.

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