CVE-2021-4235

Public Exploit

Denial of service in gopkg.in/yaml.v2

Description

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.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.04%

Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory go.dev

Affected: gopkg.in/yaml.v2 gopkg.in/yaml.v2

Affected: github.com/go-yaml/yaml github.com/go-yaml/yaml

References

Link	Tags
https://github.com/go-yaml/yaml/pull/375	exploit third party advisory patch
https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241	third party advisory patch
https://pkg.go.dev/vuln/GO-2021-0061	third party advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html

Frequently Asked Questions

What is the severity of CVE-2021-4235?: CVE-2021-4235 has been scored as a medium severity vulnerability.
How to fix CVE-2021-4235?: To fix CVE-2021-4235, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-4235 being actively exploited in the wild?: It is possible that CVE-2021-4235 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-4235?: CVE-2021-4235 affects gopkg.in/yaml.v2 gopkg.in/yaml.v2, github.com/go-yaml/yaml github.com/go-yaml/yaml.

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