{"id":"CVE-2023-24620","aliases":["GHSA-vj49-j7rc-h54f"],"url":"https://o3.security/vulnerability/CVE-2023-24620","summary":"Esoteric YamlBeans XML Entity Expansion vulnerability","details":"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.","published":"2023-08-25T00:00:00Z","modified":"2026-07-15T01:49:15.471117061Z","cvss":{"score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Maven","name":"com.esotericsoftware.yamlbeans:yamlbeans","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://contrastsecurity.com"},{"type":"WEB","url":"https://github.com/Contrast-Security-OSS/yamlbeans/blob/main/SECURITY.md"},{"type":"WEB","url":"https://github.com/EsotericSoftware"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/24xxx/CVE-2023-24620.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-24620"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:15.471117061Z"}}