{"id":"CVE-2016-9063","title":"An integer overflow during the parsing of XML using the Expat library","summary":"An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-190"],"vendor":"mozilla","product":"firefox","affected":["firefox < 50","debian_linux = 8.0","debian_linux = 9.0","debian_linux = 10.0","python >= 2.7.0, < 2.7.15","python >= 3.3.0, < 3.3.7","python >= 3.4.0, < 3.4.7","python >= 3.5.0, < 3.5.4","python >= 3.6.0, < 3.6.2"],"patched":["firefox 50","python 3.6.2"],"published":"2018-06-11","updated":"2026-10-08","sourceUpdated":"2026-10-08T21:17:05.440","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2016-9063","references":[{"url":"http://www.securityfocus.com/bid/94337","label":"security@mozilla.org"},{"url":"http://www.securitytracker.com/id/1037298","label":"security@mozilla.org"},{"url":"http://www.securitytracker.com/id/1039427","label":"security@mozilla.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1274777","label":"security@mozilla.org"},{"url":"https://www.debian.org/security/2017/dsa-3898","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2016-89/","label":"security@mozilla.org"},{"url":"http://www.securityfocus.com/bid/94337","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1037298","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1039427","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1274777","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2017/dsa-3898","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2016-89/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"epss":0.05472,"epssPercentile":0.9259,"ingestedAt":"2026-10-08T22:11:53.693Z","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-08T20:58:11.571362Z"},"slug":"CVE-2016-9063","body":"## Overview\n\nAn integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.\n\n## Affected\n\n- `firefox < 50`\n- `debian_linux = 8.0`\n- `debian_linux = 9.0`\n- `debian_linux = 10.0`\n- `python >= 2.7.0, < 2.7.15`\n- `python >= 3.3.0, < 3.3.7`\n- `python >= 3.4.0, < 3.4.7`\n- `python >= 3.5.0, < 3.5.4`\n- `python >= 3.6.0, < 3.6.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 50`\n- `python 3.6.2`","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":53.9,"likelihood":1.1,"exploitation":0,"ransomware":0},"changes":[]}