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Medium, CVSS 5.5

Esoteric YamlBeans XML Entity Expansion vulnerability

CVE-2023-24620GHSA-vj49-j7rc-h54f

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Maven com.esotericsoftware.yamlbeans:yamlbeans

    Affected
    <= 1.15
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.5 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS
  • CVE-2023-24620: 0.36% estimated exploitation activity in the next 30 days; percentile 30.29 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-vj49-j7rc-h54f

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2023-24620

Advisory: Esoteric YamlBeans XML Entity Expansion vulnerability
IDs: CVE-2023-24620, GHSA-vj49-j7rc-h54f
Record: https://patchnext.com/advisories/cve-2023-24620 (revision 1, source checked 26 Oct 2026, 16:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.esotericsoftware.yamlbeans:yamlbeans: affected <= 1.15

## Suggested inspection (read-only)
- Maven com.esotericsoftware.yamlbeans:yamlbeans: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on com.esotericsoftware.yamlbeans:yamlbeans.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-vj49-j7rc-h54f (GitHub-reviewed advisory GHSA-vj49-j7rc-h54f lists affected ranges: Maven com.esotericsoftware.yamlbeans:yamlbeans >=0 <=1.15)

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