Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in elixir-mint Mint allows HTTP Request Splitting and HTTP Request Smuggling.
In lib/mint/http1/request.ex, the encode_request_line/2 function splices the caller-supplied method and target arguments directly into the HTTP/1 request line without any character validation: [method, ?\s, target, " HTTP/1.1\r\n"]. An application that forwards attacker-controlled input as the HTTP method or target to Mint.HTTP.request/5 is therefore exposed to request-line CRLF injection: the attacker can terminate the request line early, inject arbitrary headers, and smuggle an entirely separate pipelined HTTP request onto the same TCP connection.
Mint 1.7.0 introduced validate_request_target/2, which rejects CRLF and other control characters in the target by default and closes the path/query vector unless the caller opts out via skip_target_validation: true. The method field remains unvalidated, so the method-based injection is exploitable under the default Mint configuration on all versions.
This issue affects mint: from 0.1.0 before 1.9.0.
CVSS
No CVSS.
References
Configurations
No configuration.
History
02 Jun 2026, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/elixir-mint/mint/security/advisories/GHSA-2pg6-44cx-c49v - |
02 Jun 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-02 16:16
Updated : 2026-06-02 20:16
NVD link : CVE-2026-48861
Mitre link : CVE-2026-48861
CVE.ORG link : CVE-2026-48861
JSON object : View
Products Affected
No product.
CWE
CWE-93
Improper Neutralization of CRLF Sequences ('CRLF Injection')