CVE-2026-78437

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{"affected_release": [{"advisory": "RHSA-2026:68257", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "tomcat10-main-10.1.60-0.1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68258", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "tomcat11-main-11.0.26-0.1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-09-16T00:00:00Z"}], "bugzilla": {"description": "tomcat: Apache Tomcat: Denial of Service via malformed HTTP/2 request", "id": "2539533", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539533"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-459", "details": ["Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.\nThis issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.\nUsers are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.", "A flaw was found in Apache Tomcat. An incomplete cleanup vulnerability allows a remote attacker to send a malformed HTTP/2 request. This can potentially cause a denial of service, leading to one request from another user failing."], "name": "CVE-2026-78437", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "tomcat", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "tomcat9", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "tomcat6", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "tomcat", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "pki-deps:10.6/pki-servlet-engine", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "tomcat", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "pki-servlet-engine", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "tomcat", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "hi/tomcat", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5", "fix_state": "Under investigation", "package_name": "jws5-tomcat", "product_name": "Red Hat JBoss Web Server 5"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:6", "fix_state": "Under investigation", "package_name": "jws6-tomcat", "product_name": "Red Hat JBoss Web Server 6"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:7", "fix_state": "Under investigation", "package_name": "jws7-tomcat", "product_name": "Red Hat JBoss Web Server 7"}], "public_date": "2026-09-23T11:26:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-78437\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-78437\nhttps://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg"], "threat_severity": "Moderate"}

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