{"id":"CVE-2026-77791","title":"Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.7…","summary":"Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.7…","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-400"],"vendor":"Apache Software Foundation","product":"Apache Tomcat","affected":["apache_tomcat >= 11.0.0-M5 <= 11.0.25","apache_tomcat >= 10.1.8 <= 10.1.59","apache_tomcat >= 9.0.74 <= 9.0.121","apache_tomcat >= 8.5.88 <= 8.5.100"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T13:17:29.853","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77791","references":[{"url":"https://lists.apache.org/thread/mb1pjjooqytrl6hbvbt3rw1lqwlon4cz","label":"security@apache.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-23T12:44:33.453302Z"},"ingestedAt":"2026-09-23T12:24:04.182Z","slug":"CVE-2026-77791","body":"## Overview\n\nUncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121.\n\n\n\nThe following versions were EOL at the time the CVE was created but are \nknown to be affected: from 8.5.88 through 8.5.100. Other unsupported versions may also be affected.\n\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,"exploitation":0,"ransomware":0},"changes":[{"seq":209672,"id":"CVE-2026-77791","ts":1790169918642,"field":"cvss","old":null,"new":"7.5"},{"seq":209671,"id":"CVE-2026-77791","ts":1790169918642,"field":"severity","old":"none","new":"high"}]}