By using an invalid transfer-encoding header, an attacker could smuggle an HTTP response.
Originally reported by @ZeddYu, who has our thanks for the detailed report.
The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.
If you have any questions or comments about this advisory:
{ "nvd_published_at": "2020-05-22T15:15:00Z", "cwe_ids": [ "CWE-444" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2020-05-22T14:40:36Z" }