{"id":"CVE-2026-42498","summary":"Apache Tomcat: WebSocket authentication header exposure","details":"Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109.\n\nUsers are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.","aliases":["BIT-tomcat-2026-42498","GHSA-fv25-8xcx-gqjc"],"modified":"2026-06-09T09:14:09.360607601Z","published":"2026-05-12T15:17:56.531Z","related":["CGA-g58r-4qjr-879w","SUSE-SU-2026:2299-1","openSUSE-SU-2026:10925-1","openSUSE-SU-2026:10926-1","openSUSE-SU-2026:10927-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42498.json","cwe_ids":["CWE-200"],"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"11.0.0-M1"},{"last_affected":"11.0.21"},{"introduced":"10.1.0-M1"},{"last_affected":"10.1.54"},{"introduced":"9.0.2"},{"last_affected":"9.0.117"},{"introduced":"8.5.24"},{"last_affected":"8.5.100"},{"introduced":"7.0.83"},{"last_affected":"7.0.109"}]},{"source":"DESCRIPTION","extracted_events":[{"introduced":"11.0.0-M1"},{"fixed":"11.0.21"},{"introduced":"10.1.0-M1"},{"fixed":"10.1.54"},{"introduced":"9.0.2"},{"fixed":"9.0.117"},{"introduced":"8.5.24"},{"fixed":"8.5.100"},{"introduced":"7.0.83"},{"fixed":"7.0.109"}]}],"cna_assigner":"apache"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/12/14"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42498.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42498"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat","events":[{"introduced":"e498667bd7811e846771a852b16ce9f1e524b81b"},{"last_affected":"2cdef2c0241cdf70b5edd88d3733a52e6b675047"},{"introduced":"e37b977db6f47e4380ad67114a49e8568951c953"},{"last_affected":"eddcf278ad919382608ada1898b2c5b63675c6d5"}],"database_specific":{"source":"CPE_RANGE","extracted_events":[{"introduced":"7.0.0"},{"last_affected":"7.0.109"},{"introduced":"8.5.0"},{"last_affected":"8.5.100"}],"cpe":"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*"}}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-42498.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"}]}