{"id":"CVE-2026-48861","summary":"CRLF injection in HTTP/1 request line via unvalidated method in Mint","details":"Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in elixir-mint Mint allows HTTP Request Splitting and HTTP Request Smuggling.\n\nIn 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.\n\nMint 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.\n\nThis issue affects mint: from 0.1.0 before 1.9.0.","aliases":["EEF-CVE-2026-48861","GHSA-2pg6-44cx-c49v"],"modified":"2026-06-18T03:55:04.895680341Z","published":"2026-06-02T14:15:09.015Z","database_specific":{"cna_assigner":"EEF","cwe_ids":["CWE-93"],"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"8db1acff30b6a9433762c18b1e1f891b8c1f74f7"},{"fixed":"fad091454cbb7449b19edb8e1fee12ca7cf28c3a"}]}],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48861.json"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-48861.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-48861"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48861.json"},{"type":"ADVISORY","url":"https://github.com/elixir-mint/mint/security/advisories/GHSA-2pg6-44cx-c49v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48861"},{"type":"FIX","url":"https://github.com/elixir-mint/mint/commit/fad091454cbb7449b19edb8e1fee12ca7cf28c3a"},{"type":"PACKAGE","url":"https://github.com/elixir-mint/mint"},{"type":"PACKAGE","url":"https://github.com/elixir-mint/mint.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/elixir-mint/mint","events":[{"introduced":"47889857fb36f07606ad9c2e52080d202d419058"},{"fixed":"d1c8c5cafdfe5d3fdf1e42a2d0594d26855a12a1"},{"fixed":"fad091454cbb7449b19edb8e1fee12ca7cf28c3a"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0.1.0"},{"fixed":"1.9.0"}]}}],"versions":["v1.8.0","v1.7.1","v1.7.0","v1.6.2","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.2","v1.4.1","v1.4.0","v1.3.0","v1.2.1","v1.2.0","v1.1.0","v1.0.0","v0.5.0","v0.4.0","v0.2.1","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-48861.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"}]}