CVE-2025-6442

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.

Reserved 2025-06-20 | Published 2025-06-25 | Updated 2025-06-25 | Assigner zdi

Problem types

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Product status

Default status
unknown

1.8.1
affected

References

www.zerodayinitiative.com/advisories/ZDI-25-414/ (ZDI-25-414)

github.com/...ommit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101 (vendor-provided URL) vendor-advisory

cve.org (CVE-2025-6442)

nvd.nist.gov (CVE-2025-6442)

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