Command injection in Yamale
23andMe Yamale before 3.0.8 allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses eval as part of its processing, and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema, each line is run through Python's eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus, by exploiting the vulnerability, an attacker can run arbitrary code on the image that invokes Yamale.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | yamale | < 3.0.8 | 3.0.8 |
References
- https://github.com/23andMe/Yamale/releases/tag/3.0.8
- https://github.com/23andMe/Yamale/pull/165
- https://github.com/advisories/GHSA-435p-f82x-mxwm
- https://nvd.nist.gov/vuln/detail/CVE-2021-38305
- https://github.com/23andMe/Yamale
- https://github.com/pypa/advisory-database/tree/main/vulns/yamale/PYSEC-2021-119.yaml
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-434, CWE-78- Platform
- Python (PyPI)
- Package
yamale- Disclosed
- 09.08.2021
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2021-119 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-435p-f82x-mxwm - CC BY 4.0
Vulnerability history: yamale
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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