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.
{ "nvd_published_at": "2021-03-01T12:15:00Z", "cwe_ids": [ "CWE-200" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2021-03-24T19:53:13Z" }