CVE-2026-65637

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-65637", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-07-22T14:38:10.136Z", "datePublished": "2026-08-25T21:49:13.127Z", "dateUpdated": "2026-08-26T15:20:30.366Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-08-25T21:49:13.127Z"}, "title": "Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete", "problemTypes": [{"descriptions": [{"description": "CWE-20 Improper Input Validation", "lang": "en", "cweId": "CWE-20", "type": "CWE"}]}], "source": {"discovery": "EXTERNAL"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Tomcat", "versions": [{"status": "affected", "version": "11.0.20", "lessThanOrEqual": "11.0.24", "versionType": "semver"}, {"status": "affected", "version": "10.1.53", "lessThanOrEqual": "10.1.57", "versionType": "semver"}, {"status": "affected", "version": "9.0.115", "lessThanOrEqual": "9.0.120", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"value": "Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.\n\n\n\nUsers are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990.</p><p>This issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.</p><p>Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.</p>"}]}], "references": [{"url": "https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Parag Ambildhuke (https://github.com/paragxa)", "type": "finder"}], "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-08-26T15:20:15.521688Z", "id": "CVE-2026-65637", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-26T15:20:30.366Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-65637", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-08-26T15:20:15.521688Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-26T15:20:26.740Z"}}], "cna": {"title": "Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Parag Ambildhuke (https://github.com/paragxa)"}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Tomcat", "versions": [{"status": "affected", "version": "11.0.20", "versionType": "semver", "lessThanOrEqual": "11.0.24"}, {"status": "affected", "version": "10.1.53", "versionType": "semver", "lessThanOrEqual": "10.1.57"}, {"status": "affected", "version": "9.0.115", "versionType": "semver", "lessThanOrEqual": "9.0.120"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.\n\n\n\nUsers are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.", "supportingMedia": [{"type": "text/html", "value": "<p>Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990.</p><p>This issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.</p><p>Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-08-25T21:49:13.127Z"}}}, "cveMetadata": {"cveId": "CVE-2026-65637", "state": "PUBLISHED", "dateUpdated": "2026-08-26T15:20:30.366Z", "dateReserved": "2026-07-22T14:38:10.136Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-08-25T21:49:13.127Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache Tomcat", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "11.0.24", "status": "affected", "version": "11.0.20", "versionType": "semver"}, {"lessThanOrEqual": "10.1.57", "status": "affected", "version": "10.1.53", "versionType": "semver"}, {"lessThanOrEqual": "9.0.120", "status": "affected", "version": "9.0.115", "versionType": "semver"}]}], "source": "security@apache.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "matchCriteriaId": "0267823D-98C8-4283-B198-185275D06486", "versionEndExcluding": "9.0.121", "versionStartIncluding": "9.0.115", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "matchCriteriaId": "85549589-C5B3-4093-ABF2-37528529AE65", "versionEndExcluding": "10.1.58", "versionStartIncluding": "10.1.53", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "matchCriteriaId": "3070A357-ABBD-4CE7-894B-CAB8F8E9F342", "versionEndExcluding": "11.0.25", "versionStartIncluding": "11.0.20", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.\n\n\n\nUsers are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue."}], "id": "CVE-2026-65637", "lastModified": "2026-08-27T15:19:42.247", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-65637", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-26T15:20:15.521688Z", "version": "2.0.3"}}]}, "published": "2026-08-25T22:17:05.177", "references": [{"source": "security@apache.org", "tags": ["Vendor Advisory", "Mailing List"], "url": "https://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "Apache Tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation", "id": "2524155", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524155"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990.\nThis issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.\nUsers are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.", "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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-65637", "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: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": "tomcat", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Under investigation", "package_name": "tomcat10", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Under investigation", "package_name": "tomcat11", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5", "fix_state": "Out of support scope", "package_name": "tomcat", "product_name": "Red Hat JBoss Web Server 5"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:6", "fix_state": "Affected", "package_name": "tomcat", "product_name": "Red Hat JBoss Web Server 6"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:7", "fix_state": "Affected", "package_name": "tomcat", "product_name": "Red Hat JBoss Web Server 7"}], "public_date": "2026-08-25T21:49:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-65637\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-65637\nhttps://lists.apache.org/thread/djog953z1ohsyt25bdvhfzbmsy22vgcj"], "statement": "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.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.20,11.0.24]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.1.53,10.1.57]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.115,9.0.120]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache Tomcat", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "tomcat", "vendor": "apache"}], "created": "2026-08-26T01:45:03.138405+00:00", "updated": "2026-09-01T14:30:18.149517+00:00", "vendors": ["apache", "apache$PRODUCT$tomcat"]}