CVE-2025-6442
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability
- State
- Published
- Severity
- 6.5 Medium
- Published
- Jun 25, 2025
- Updated
- Jun 25, 2025
- Reserved
- Jun 20, 2025
Description
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions.
The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 6.5 Medium | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N | zdi |
Weaknesses
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Products
| Product | Versions |
|---|---|
WEBrickRuby |
|
References
- ZDI-25-414
- vendor-provided URLvendor-advisory
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