CVE-2021-4235: YAML Go package vulnerable to denial of service

December 28, 2022 (updated April 11, 2025)

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.

References

github.com/advisories/GHSA-r88r-gmrh-7j83
github.com/go-yaml/yaml
github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
github.com/go-yaml/yaml/pull/375
lists.debian.org/debian-lts-announce/2023/07/msg00001.html
nvd.nist.gov/vuln/detail/CVE-2021-4235
pkg.go.dev/vuln/GO-2021-0061

Code Behaviors & Features

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