When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.
{ "cpes": [ "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:-:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone10:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone1:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone2:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone3:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone4:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone5:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone6:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone7:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone8:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:10.0.0:milestone9:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone16:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone17:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone18:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone19:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone20:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone22:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone23:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone24:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone25:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone26:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone27:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone2:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone3:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone4:*:*:*:*:*:*", "cpe:2.3:a:apache:tomcat:9.0.0:milestone5:*:*:*:*:*:*" ], "severity": "High" }