CWE-93

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            }
          ],
          "value": "Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027) vulnerability in wojtekmach Req allows multipart parameter smuggling via attacker-influenced part metadata.\n\nReq.Utils.encode_form_part/2 in lib/req/utils.ex builds the per-part headers by interpolating the caller-supplied name, filename, and content_type values directly into the content-disposition and content-type lines with no escaping or CRLF stripping. A value containing \", \\r, or \\n closes the surrounding quoted value and starts a new header line; an additional \\r\\n--\u003cboundary\u003e terminates the current part and prepends a smuggled part of the attacker\u0027s choosing.\n\nThis is reachable through every supported way of supplying a part. It is particularly easy when value is a %File.Stream{}, because filename then defaults to Path.basename(stream.path) and POSIX filenames may legitimately contain \\r and \\n. Any application that forwards user-controlled filenames (or field names / MIME types) through Req.post/2 with form_multipart: lets an attacker inject arbitrary headers into the outgoing multipart body or smuggle additional fields and parts into the request the victim service sends downstream.\n\nThis issue affects req: from 0.5.3 before 0.6.0."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-33",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-33 HTTP Request Smuggling"
            }
          ]
        },
        {
          "capecId": "CAPEC-105",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-105 HTTP Request Splitting"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-93",
              "description": "CWE-93 Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-08T16:34:58.505Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "related"
          ],
          "url": "https://github.com/wojtekmach/req/security/advisories/GHSA-px9f-whj3-246m"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-49756.html"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49756"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/wojtekmach/req/commit/74506ff2c5addf74df85d79dc726e9b2e264a8ba"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Multipart form-data header injection in Req via unescaped name/filename/content_type",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eSanitize attacker-influenced \u003ctt\u003ename\u003c/tt\u003e, \u003ctt\u003efilename\u003c/tt\u003e, and \u003ctt\u003econtent_type\u003c/tt\u003e values before passing them to \u003ctt\u003e\u0027Elixir.Req\u0027:post/2\u003c/tt\u003e with \u003ctt\u003eform_multipart:\u003c/tt\u003e. At minimum, reject (or strip) any value containing \u003ctt\u003e\\r\u003c/tt\u003e, \u003ctt\u003e\\n\u003c/tt\u003e, or \u003ctt\u003e\"\u003c/tt\u003e. When forwarding uploads, derive \u003ctt\u003efilename\u003c/tt\u003e from a normalised string rather than \u003ctt\u003ePath.basename/1\u003c/tt\u003e on a user-controlled path.\u003c/p\u003e"
            }
          ],
          "value": "Sanitize attacker-influenced name, filename, and content_type values before passing them to Req.post/2 with form_multipart:. At minimum, reject (or strip) any value containing \\r, \\n, or \". When forwarding uploads, derive filename from a normalised string rather than Path.basename/1 on a user-controlled path."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-49756",
    "datePublished": "2026-06-08T15:20:24.035Z",
    "dateReserved": "2026-06-01T13:45:22.448Z",
    "dateUpdated": "2026-06-08T16:34:58.505Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}