{"cve":"CVE-2017-18640","nvd":{"published":"2019-12-12T03:15:10.850","modified":"2026-06-17T01:13:12.817","status":"Modified","description":"The Alias feature in SnakeYAML before 1.26 allows entity expansion during a load operation, a related issue to CVE-2003-1564.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-776"],"references":["https://bitbucket.org/asomov/snakeyaml/issues/377/allow-configuration-for-preventing-billion","https://bitbucket.org/asomov/snakeyaml/wiki/Billion%20laughs%20attack","https://bitbucket.org/snakeyaml/snakeyaml/issues/377","https://bitbucket.org/snakeyaml/snakeyaml/wiki/Changes","https://lists.apache.org/thread.html/r1058e7646988394de6a3fd0857ea9b1ee0de14d7bb28fee5ff782457%40%3Ccommits.atlas.apache.org%3E"],"products":["fedoraproject:fedora","oracle:peoplesoft_enterprise_pt_peopletools","quarkus:quarkus","snakeyaml_project:snakeyaml"],"source":"nvd","synced_at":"2026-10-19T20:59:27.069234358+00:00"},"epss":{"cve":"CVE-2017-18640","score":0.26723,"percentile":0.98028,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rvwf-54qp-4r6v","url":"https://osv.dev/vulnerability/GHSA-rvwf-54qp-4r6v","summary":"SnakeYAML Entity Expansion during load operation","modified":"2024-03-15T05:36:20.539640Z","packages":[{"ecosystem":"Maven","name":"org.yaml:snakeyaml","purl":"pkg:maven/org.yaml/snakeyaml","ranges":["<1.26"],"fixed":["1.26"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}