{"schema_version":"1.7.5","id":"CVE-2018-20843","published":"2019-06-24T17:15:09.980Z","modified":"2026-07-08T19:45:28.083240Z","related":["ALSA-2020:4846","SUSE-SU-2019:1834-1","SUSE-SU-2019:1835-1","openSUSE-SU-2019:1777-1","openSUSE-SU-2024:10748-1"],"details":"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).","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libexpat/libexpat","events":[{"introduced":"0"},{"fixed":"d3b78b42a2dcdea98e22625cfff67a49d47e6025"}],"database_specific":{"cpe":"cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.2.7"}],"source":"CPE_RANGE"}}],"versions":["R_2_2_6","R_2_2_5","R_2_2_4","R_2_2_3","R_2_2_2","R_2_2_1","R_2_2_0","R_2_1_1","R_2_1_0","R_2_0_1","R_2_0_0","R_1_95_8","R_1_95_7","R_1_95_6","R_1_95_5","R_1_95_4","R_1_95_3","R_1_95_2","R_1_95_0","libexpat-alpha-1","start","sourceforge_init","jclark-orig","V20000512","V19991013","V19990728","V19990709","V19990626","V1_1","V19990425","V1990307","V19990109","V19981231","V19981122","V1_0","beta4","beta3","beta2","REC1_0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20843.json","vanir_signatures":[{"deprecated":false,"digest":{"function_hash":"10718674393994758979083102855553023681","length":670},"id":"CVE-2018-20843-74406d59","signature_type":"Function","signature_version":"v1","source":"https://github.com/libexpat/libexpat/commit/d3b78b42a2dcdea98e22625cfff67a49d47e6025","target":{"file":"expat/tests/runtests.c","function":"START_TEST"}},{"deprecated":false,"digest":{"line_hashes":["70970158302216444732948686873374648009","197734145770944038326200234670765972062","333002349092091346504095730741649465004","132190683235044997527211951942674695301"],"threshold":0.9},"id":"CVE-2018-20843-ee80e572","signature_type":"Line","signature_version":"v1","source":"https://github.com/libexpat/libexpat/commit/d3b78b42a2dcdea98e22625cfff67a49d47e6025","target":{"file":"expat/tests/runtests.c"}}],"vanir_signatures_modified":"2026-07-08T19:45:28Z"}}],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html"},{"type":"ADVISORY","url":"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html"},{"type":"ADVISORY","url":"https://seclists.org/bugtraq/2019/Jun/39"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/201911-08"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20190703-0001/"},{"type":"ADVISORY","url":"https://support.f5.com/csp/article/K51011533"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4040-1/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4040-2/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2019/dsa-4472"},{"type":"ADVISORY","url":"https://www.tenable.com/security/tns-2021-11"},{"type":"REPORT","url":"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226"},{"type":"FIX","url":"https://github.com/libexpat/libexpat/issues/186"},{"type":"FIX","url":"https://github.com/libexpat/libexpat/pull/262"},{"type":"FIX","url":"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuApr2021.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuapr2020.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuoct2020.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:a:oracle:hospitality_res_3700:*:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"5.7"},{"last_affected":"5.7.6"}],"source":"CPE_RANGE","vendor_product":"oracle:hospitality_res_3700"},{"cpes":["cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*"],"extracted_events":[{"fixed":"8.15.0"}],"source":"CPE_RANGE","vendor_product":"tenable:nessus"},{"cpes":["cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"12.04"},{"last_affected":"12.04"},{"introduced":"14.04"},{"last_affected":"14.04"},{"introduced":"16.04"},{"last_affected":"16.04"},{"introduced":"18.04"},{"last_affected":"18.04"},{"introduced":"18.10"},{"last_affected":"18.10"},{"introduced":"19.04"},{"last_affected":"19.04"}],"source":"CPE_STRING","vendor_product":"canonical:ubuntu_linux"},{"cpes":["cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.0"},{"last_affected":"8.0"},{"introduced":"9.0"},{"last_affected":"9.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux"},{"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