{"cve":"CVE-2018-20843","nvd":{"published":"2019-06-24T17:15:09.980","modified":"2026-10-14T07:16:43.890","status":"Modified","description":"In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).","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-611"],"references":["http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html","https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226","https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes","https://github.com/libexpat/libexpat/issues/186","https://github.com/libexpat/libexpat/pull/262"],"products":["canonical:ubuntu_linux","debian:debian_linux","fedoraproject:fedora","libexpat_project:libexpat","opensuse:leap","oracle:hospitality_res_3700","oracle:http_server","oracle:outside_in_technology","tenable:nessus"],"source":"nvd","synced_at":"2026-10-19T20:57:00.690689396+00:00"},"epss":{"cve":"CVE-2018-20843","score":0.07107,"percentile":0.94196,"date":"2026-10-25"},"kev":null,"osv":[],"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."]}