{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-88041", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-09-09T20:29:03.987Z", "datePublished": "2026-10-20T13:43:28.681Z", "dateUpdated": "2026-10-20T18:10:05.285Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-20T13:43:28.681Z"}, "title": "Apache Tomcat: HTTP/2 trailer header cross-contamination", "problemTypes": [{"descriptions": [{"description": "CWE-459 Incomplete cleanup", "lang": "en", "cweId": "CWE-459", "type": "CWE"}]}], "source": {"discovery": "EXTERNAL"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Tomcat", "versions": [{"status": "affected", "version": "11.0.0-M23", "lessThanOrEqual": "11.0.26", "versionType": "semver"}, {"status": "affected", "version": "10.1.27", "lessThanOrEqual": "10.1.60", "versionType": "semver"}, {"status": "affected", "version": "9.0.92", "lessThanOrEqual": "9.0.122", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"value": "Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122.\n\n\n\nUsers are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request.</p><p>This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122.</p><p>Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.</p>"}]}], "references": [{"url": "https://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "low"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Wentao He", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/10/20/24"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-10-20T18:10:05.285Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache Tomcat", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "11.0.26", "status": "affected", "version": "11.0.0-M23", "versionType": "semver"}, {"lessThanOrEqual": "10.1.60", "status": "affected", "version": "10.1.27", "versionType": "semver"}, {"lessThanOrEqual": "9.0.122", "status": "affected", "version": "9.0.92", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122.\n\n\n\nUsers are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue."}], "id": "CVE-2026-88041", "lastModified": "2026-10-20T19:34:00.700", "metrics": {}, "published": "2026-10-20T14:17:04.097", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/10/20/24"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-459"}], "source": "security@apache.org", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2026:81365", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "tomcat11-main-11.0.27-0.1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-10-12T00:00:00Z"}, {"advisory": "RHSA-2026:85926", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "tomcat10-main-10.1.61-0.1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-10-20T00:00:00Z"}], "bugzilla": {"description": "tomcat: tomcat: Information disclosure via incomplete HTTP trailer cleanup", "id": "2556182", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556182"}, "csaw": false, "cwe": "CWE-459", "details": ["A flaw was found in Apache Tomcat. Due to an incomplete cleanup vulnerability, HTTP (Hypertext Transfer Protocol) trailer headers from a previous request can persist and leak into a subsequent request processed on the same connection. This issue may allow a remote user to access sensitive request data belonging to another client, resulting in information disclosure."], "name": "CVE-2026-88041", "public_date": "2026-10-20T13:43:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88041\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88041\nhttps://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1"], "threat_severity": "Low"}