CVE-2021-4235

MediumCVSS 5.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected software

Vendor	Product	Versions
gopkg.in/yaml.v2	gopkg.in/yaml.v2	< 2.2.3
github.com/go-yaml/yaml	github.com/go-yaml/yaml	—

References

https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241Patch, Third Party Advisory
https://github.com/go-yaml/yaml/pull/375Exploit, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
https://pkg.go.dev/vuln/GO-2021-0061Third Party Advisory
https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241Patch, Third Party Advisory
https://github.com/go-yaml/yaml/pull/375Exploit, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
https://pkg.go.dev/vuln/GO-2021-0061Third Party Advisory

Timeline

Published: Dec 27, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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