{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Moderate" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-65637.json" } ], "title": "Apache Tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation", "tracking": { "current_release_date": "2026-09-03T14:36:03+00:00", "generator": { "date": "2026-09-03T14:36:03+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.16" } }, "id": "CVE-2026-65637", 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Server 5", "product_id": "red_hat_jboss_web_server_5:tomcat" }, "product_reference": "tomcat", "relates_to_product_reference": "red_hat_jboss_web_server_5" }, { "category": "default_component_of", "full_product_name": { "name": "tomcat as a component of Red Hat JBoss Web Server 6", "product_id": "red_hat_jboss_web_server_6:tomcat" }, "product_reference": "tomcat", "relates_to_product_reference": "red_hat_jboss_web_server_6" }, { "category": "default_component_of", "full_product_name": { "name": "tomcat as a component of Red Hat JBoss Web Server 7", "product_id": "red_hat_jboss_web_server_7:tomcat" }, "product_reference": "tomcat", "relates_to_product_reference": "red_hat_jboss_web_server_7" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-65637", "cwe": { "id": "CWE-444", "name": "Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')" }, "discovery_date": "2026-08-25T22:01:42.012077+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2524155" } ], "notes": [ { "category": "description", "text": "A flaw was found in Apache Tomcat. This improper input validation vulnerability, stemming from an incomplete fix for CVE-2026-32990, allows for an HTTP/2 no-authority bypass of strict Server Name Indication (SNI) validation. This could potentially lead to unauthorized access or misrouting of requests.", "title": "Vulnerability description" }, { "category": "summary", "text": "Apache Tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation", "title": "Vulnerability summary" }, { "category": "other", "text": "This Moderate flaw in Apache Tomcat allows an HTTP/2 no-authority bypass of strict Server Name Indication (SNI) validation due to improper input handling. This could lead to requests being misrouted to an unintended virtual host, potentially exposing sensitive information or causing service disruption in specific configurations. The impact is limited as it primarily affects request routing rather than arbitrary code execution.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "Red Hat Hardened Images:tomcat10-main@noarch", "Red Hat Hardened Images:tomcat10-main@src", "Red Hat Hardened Images:tomcat11-main@noarch", "Red Hat Hardened Images:tomcat11-main@src" ], "known_affected": [ "red_hat_jboss_web_server_5:tomcat", "red_hat_jboss_web_server_6:tomcat", "red_hat_jboss_web_server_7:tomcat" ], "under_investigation": [ "red_hat_enterprise_linux_10:tomcat", "red_hat_enterprise_linux_10:tomcat-admin-webapps", "red_hat_enterprise_linux_10:tomcat-docs-webapp", "red_hat_enterprise_linux_10:tomcat-el-5.0-api", 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"red_hat_enterprise_linux_7:tomcat-lib", "red_hat_enterprise_linux_7:tomcat-servlet-3.0-api", "red_hat_enterprise_linux_7:tomcat-webapps", "red_hat_enterprise_linux_7:tomcat.src", "red_hat_enterprise_linux_8:pki-servlet-4.0-api::pki-deps:10.6", "red_hat_enterprise_linux_8:pki-servlet-engine.src::pki-deps:10.6", "red_hat_enterprise_linux_8:pki-servlet-engine::pki-deps:10.6", "red_hat_enterprise_linux_8:tomcat", "red_hat_enterprise_linux_8:tomcat-admin-webapps", "red_hat_enterprise_linux_8:tomcat-docs-webapp", "red_hat_enterprise_linux_8:tomcat-el-3.0-api", "red_hat_enterprise_linux_8:tomcat-jsp-2.3-api", "red_hat_enterprise_linux_8:tomcat-lib", "red_hat_enterprise_linux_8:tomcat-servlet-4.0-api", "red_hat_enterprise_linux_8:tomcat-webapps", "red_hat_enterprise_linux_8:tomcat.src", "red_hat_enterprise_linux_9:tomcat", "red_hat_enterprise_linux_9:tomcat-admin-webapps", "red_hat_enterprise_linux_9:tomcat-docs-webapp", "red_hat_enterprise_linux_9:tomcat-el-3.0-api", "red_hat_enterprise_linux_9:tomcat-jsp-2.3-api", "red_hat_enterprise_linux_9:tomcat-lib", "red_hat_enterprise_linux_9:tomcat-servlet-4.0-api", "red_hat_enterprise_linux_9:tomcat-webapps", "red_hat_enterprise_linux_9:tomcat.src" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-65637" }, { "category": "external", "summary": "RHBZ#2524155", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524155" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-65637", "url": "https://www.cve.org/CVERecord?id=CVE-2026-65637" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-65637", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65637" }, { "category": "external", "summary": "https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj", "url": "https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj" } ], "release_date": "2026-08-25T21:49:13.127000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-09-03T09:43:07+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/", "product_ids": [ "Red Hat Hardened Images:tomcat10-main@noarch", "Red Hat Hardened Images:tomcat10-main@src" ], "url": "https://access.redhat.com/errata/RHSA-2026:63137" }, { "category": "vendor_fix", "date": "2026-08-18T09:28:35+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/", "product_ids": [ "Red Hat Hardened Images:tomcat11-main@noarch", "Red Hat Hardened Images:tomcat11-main@src" ], "url": "https://access.redhat.com/errata/RHSA-2026:56039" }, { "category": "workaround", "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.", "product_ids": [ "Red Hat Hardened Images:tomcat10-main@noarch", "Red Hat Hardened Images:tomcat10-main@src", "Red Hat Hardened Images:tomcat11-main@noarch", "Red Hat Hardened Images:tomcat11-main@src", "red_hat_jboss_web_server_5:tomcat", "red_hat_jboss_web_server_6:tomcat", "red_hat_jboss_web_server_7:tomcat" ] }, { "category": "no_fix_planned", "details": "Out of support scope", "product_ids": [ "red_hat_jboss_web_server_5:tomcat" ] }, { "category": "none_available", "details": "Affected", "product_ids": [ "red_hat_jboss_web_server_6:tomcat", "red_hat_jboss_web_server_7:tomcat" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", 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"red_hat_enterprise_linux_8:tomcat-webapps", "red_hat_enterprise_linux_8:tomcat.src", "red_hat_enterprise_linux_9:tomcat", "red_hat_enterprise_linux_9:tomcat-admin-webapps", "red_hat_enterprise_linux_9:tomcat-docs-webapp", "red_hat_enterprise_linux_9:tomcat-el-3.0-api", "red_hat_enterprise_linux_9:tomcat-jsp-2.3-api", "red_hat_enterprise_linux_9:tomcat-lib", "red_hat_enterprise_linux_9:tomcat-servlet-4.0-api", "red_hat_enterprise_linux_9:tomcat-webapps", "red_hat_enterprise_linux_9:tomcat.src", "red_hat_jboss_web_server_5:tomcat", "red_hat_jboss_web_server_6:tomcat", "red_hat_jboss_web_server_7:tomcat" ] } ], "title": "Apache Tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation" } ] }