{"id":"CVE-2022-25235","title":"xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.","summary":"xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.","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-116","CWE-116"],"vendor":"libexpat_project","product":"libexpat","affected":["libexpat < 2.4.5","debian_linux = 10.0","debian_linux = 11.0","fedora = 34","fedora = 35","http_server = 12.2.1.3.0","http_server = 12.2.1.4.0","zfs_storage_appliance_kit = 8.8","sinema_remote_connect_server < 3.1"],"patched":["libexpat 2.4.5","sinema_remote_connect_server 3.1"],"published":"2022-02-16","updated":"2026-10-14","sourceUpdated":"2026-10-14T16:17:28.010","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2022-25235","references":[{"url":"http://www.openwall.com/lists/oss-security/2022/02/19/1","label":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"cve@mitre.org"},{"url":"https://github.com/libexpat/libexpat/pull/562","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/","label":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/202209-24","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20220303-0008/","label":"cve@mitre.org"},{"url":"https://www.debian.org/security/2022/dsa-5085","label":"cve@mitre.org"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2022/02/19/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/libexpat/libexpat/pull/562","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202209-24","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20220303-0008/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2022/dsa-5085","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-484086.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","exploit-available"],"epss":0.04955,"epssPercentile":0.91995,"exploits":{"github":1,"githubRepos":["https://github.com/Satheesh575555/external_expat_AOSP10_r33_CVE-2022-25235"],"checkedAt":"2026-10-14T16:41:07.235Z"},"exploitAvailable":true,"ingestedAt":"2026-10-14T16:40:32.045Z","slug":"CVE-2022-25235","body":"## Overview\n\nxmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.\n\n## Affected\n\n- `libexpat < 2.4.5`\n- `debian_linux = 10.0`\n- `debian_linux = 11.0`\n- `fedora = 34`\n- `fedora = 35`\n- `http_server = 12.2.1.3.0`\n- `http_server = 12.2.1.4.0`\n- `zfs_storage_appliance_kit = 8.8`\n- `sinema_remote_connect_server < 3.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libexpat 2.4.5`\n- `sinema_remote_connect_server 3.1`","depth":"abyssal","depthScore":67,"depthScoreParts":{"impact":53.9,"likelihood":1,"exploitation":12,"ransomware":0},"changes":[]}