CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HCVE-2021-4235
Medium (5.5) in yaml project yaml. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in gopkg.in/yaml.v2 2.2.3.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-31)
- Published
- Modified
- Record from
- the NVD, synced
Affected
- yaml_project:yaml
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-r88r-gmrh-7j83 | Go | gopkg.in/yaml.v2 | <2.2.3 | 2.2.3 |
| GHSA-r88r-gmrh-7j83 | Go | github.com/go-yaml/yaml | <=2.1.0 | no fix published |
| GO-2021-0061 | Go | gopkg.in/yaml.v2 | <2.2.3 | 2.2.3 |
| GO-2021-0061 | Go | github.com/go-yaml/yaml | all versions | no fix published |
References
- https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
- https://github.com/go-yaml/yaml/pull/375
- https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
- https://pkg.go.dev/vuln/GO-2021-0061
- https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241