{"id":"CVE-2026-77756","title":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from ano…","summary":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from ano…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-444"],"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 >= 9.0.47 <= 9.0.121","apache_tomcat >= 8.5.67 <= 8.5.100"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T14:17:08.553","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77756","references":[{"url":"https://lists.apache.org/thread/bl5b6rxqh3vb2k9bj2794vhor7o6xl3z","label":"security@apache.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-23T13:18:16.430403Z"},"ingestedAt":"2026-09-23T11:22:32.915Z","slug":"CVE-2026-77756","body":"## Overview\n\nInconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy.\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 9.0.47 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 8.5.67 through 8.5.100. 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":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":209687,"id":"CVE-2026-77756","ts":1790173570470,"field":"cvss","old":null,"new":"3.7"},{"seq":209686,"id":"CVE-2026-77756","ts":1790173570470,"field":"severity","old":"none","new":"low"}]}