{"id":"CVE-2026-78383","title":"Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 t…","summary":"Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 t…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"Apache Software Foundation","product":"Apache Tomcat","affected":["apache_tomcat >= 11.0.0-M1 <= 11.0.25","apache_tomcat >= 10.1.0-M1 <= 10.1.59","apache_tomcat >= 9.0.0.M1 <= 9.0.121","apache_tomcat >= 8.5.0 <= 8.5.100","apache_tomcat >= 7.0.0 <= 7.0.109"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T19:19:21.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78383","references":[{"url":"https://lists.apache.org/thread/tyqcqk99g7ghgk22641vf67vghcyswnw","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/25","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-23T15:44:38.108504Z"},"ingestedAt":"2026-09-23T12:24:04.183Z","epss":0.00376,"epssPercentile":0.28858,"slug":"CVE-2026-78383","body":"## Overview\n\nAllocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.\n\n\n\nThe following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected.\n\n\n\nUsers are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":209769,"id":"CVE-2026-78383","ts":1790180880147,"field":"cvss","old":null,"new":"7.5"},{"seq":209768,"id":"CVE-2026-78383","ts":1790180880147,"field":"severity","old":"none","new":"high"}]}