{"id":"CVE-2017-18258","title":"The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is requir…","summary":"The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is requir…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"xmlsoft","product":"libxml2","affected":["libxml2 < 2.9.6"],"patched":["libxml2 2.9.6"],"published":"2018-04-08","updated":"2026-10-14","sourceUpdated":"2026-10-14T07:16:40.117","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2017-18258","references":[{"url":"https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb","label":"cve@mitre.org"},{"url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10284","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20190719-0001/","label":"cve@mitre.org"},{"url":"https://usn.ubuntu.com/3739-1/","label":"cve@mitre.org"},{"url":"https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10284","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20190719-0001/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3739-1/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.02655,"epssPercentile":0.85297,"ingestedAt":"2026-10-14T07:21:04.799Z","slug":"CVE-2017-18258","body":"## Overview\n\nThe xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.\n\n## Affected\n\n- `libxml2 < 2.9.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libxml2 2.9.6`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.5,"exploitation":0,"ransomware":0},"changes":[]}