| Package | Affected versions | Patched versions |
|---|---|---|
| webrick | ≥ 1.5.0, < 1.5.1≥ 1.6.0, < 1.6.1< 1.4.4 | 1.5.11.6.11.4.4 |
| ruby | ≥ 2.6.0, ≤ 2.6.6≥ 2.7.0, ≤ 2.7.1≤ 2.5.8 | |
| webrick | ≤ 1.6.0 |
An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.
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