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

Q: How do I fix CVE-2023-24620?

yamlbeans: upgrade to newer than 1.15. Exact commands for each OS are on this page.

Q: Is CVE-2023-24620 being exploited?

CVE-2023-24620 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-24620 affect?

CVE-2023-24620 affects yamlbeans. Severity is medium (CVSS 5.5). 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 YA

Q: How urgent is CVE-2023-24620?

Priority 32/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2023-24620 is a medium-severity flaw (CVSS 5.5) affecting yamlbeans. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-611
Published	2023-08-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: esotericsoftware

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-25 20:15 UTCPublished CVE record published
2026-06-17 05:39 UTCUpdated Record last modified

esotericsoftware yamlbeans UPGRADE

Affected: <= 1.15

Fixed in: newer than 1.15

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy yamlbeans || rpm -q yamlbeans || yamlbeans --version

2. UPGRADE to newer than 1.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yamlbeans

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yamlbeans

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-24620?

yamlbeans: upgrade to newer than 1.15. Exact commands for each OS are on this page.

Is CVE-2023-24620 being exploited?

CVE-2023-24620 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-24620 affect?

CVE-2023-24620 affects yamlbeans. Severity is medium (CVSS 5.5). 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 YA

How urgent is CVE-2023-24620?

Priority 32/100. Public exploit reference

Software pages

Java vulnerabilities

Related CVEs

CVE-2023-24621 HIGH 7.8 UPGRADE An issue was discovered in Esoteric YamlBeans through 1.15

References

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