{"items":[{"id":"NVI-00013041","kind":"vulnerability","title":"Apache Tomcat Improper Input Validation vulnerability","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-fccv-jmmp-qg76","CVE-2023-46589"],"plain_summary":"GitHub lists this reviewed advisory for org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-catalina, org.apache.tomcat.embed:tomcat-embed-core. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-02T20:14:55.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-45bd6c7580dc3578dee6d448509046e0"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-45bd6c7580dc3578dee6d448509046e0","url":"https://github.com/advisories/GHSA-fccv-jmmp-qg76","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-fccv-jmmp-qg76","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T01:40:00.567Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat:tomcat-catalina","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 11.0.0-M1, < 11.0.0-M11"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat:tomcat-catalina","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 10.1.0-M1, < 10.1.16"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat:tomcat-catalina","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 9.0.0-M1, < 9.0.83"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat:tomcat-catalina","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 8.5.0, < 8.5.96"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat.embed:tomcat-embed-core","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 11.0.0-M1, < 11.0.0-M11"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat.embed:tomcat-embed-core","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 10.1.0-M1, < 10.1.16"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat.embed:tomcat-embed-core","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 9.0.0-M1, < 9.0.83"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat.embed:tomcat-embed-core","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 8.5.0, < 8.5.96"]},{"certainty":"source_listed","source_ids":["sr-45bd6c7580dc3578dee6d448509046e0"],"technology":"org.apache.tomcat:tomcat-coyote","known_exclusions":[],"conditions_summary":"Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.","public_affected_ranges":[">= 11.0.0-M1, < 11.0.0-M11"]}],"null_published_at":"2026-11-01T07:29:12.911Z","source_updated_at":"2026-10-02T20:14:55.000Z","source_disclosed_at":"2023-11-28T18:30:23.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-01T01:40:00.567Z"}],"next_cursor":null,"snapshot_revision":"42594"}