MediumFix available

Mint HTTP/1 client applies chunked framing when chunked is not the final transfer coding, enabling response smuggling through intermediaries

Type: advisorySource: OSV1 source record

## Summary Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint mint allows a malicious HTTP/1 server to desynchronize an intermediary and the Mint client on a pooled connection, poisoning the responses to subsequent requests that share the connection. `message_body/1` in `lib/mint/http1.ex` selects chunked framing when `chunked` is the first coding listed in a response's `Transfer-Encoding` fields. RFC 9112 section 6.3 applies chunked framing only when `chunked` is the final coding, and otherwise reads the body until the server closes the connection. For a response such as `Transfer-Encoding: chunked, gzip`, an intermediary that follows the RFC treats every byte up to the close as the body, while Mint ends the body at the zero-length chunk and parses the remaining bytes as the response to the next request on the connection. Mint also keeps the connection open after an HTTP/1.0 response, final or 1xx, that carries `Transfer-Encoding` and `Connection: keep-alive`. RFC 9112 section 6.1 requires treating the framing of such a message as faulty and closing the connection after it, so bytes after its chunked body are parsed as the response to the next request in the same way. This issue affects mint: from 0.1.0 before 1.10.2. ## Details **1. Coding list.** `store_header/3` in `lib/mint/http1.ex` tokenizes each `Transfer-Encoding` field with `Mint.HTTP1.Parse.transfer_encoding_header/1` and appends the codings to `request.tra

Announced 28 Sept 2026Group revision 1

Original source ↗

EEF-CVE-2026-94194

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:EEF-CVE-2026-94194

mint

Source reference: /affected/0/package/name

Affected versions: 0.1.0
Source reference: /affected/0/versions
0.2.0
Source reference: /affected/0/versions
0.2.1
Source reference: /affected/0/versions
0.3.0
Source reference: /affected/0/versions
0.4.0
Source reference: /affected/0/versions
0.5.0
Source reference: /affected/0/versions
1.0.0
Source reference: /affected/0/versions
1.1.0
Source reference: /affected/0/versions
1.10.0
Source reference: /affected/0/versions
1.10.1
Source reference: /affected/0/versions
1.2.0
Source reference: /affected/0/versions
1.2.1
Source reference: /affected/0/versions
1.3.0
Source reference: /affected/0/versions
1.4.0
Source reference: /affected/0/versions
1.4.1
Source reference: /affected/0/versions
1.4.2
Source reference: /affected/0/versions
1.5.0
Source reference: /affected/0/versions
1.5.1
Source reference: /affected/0/versions
1.5.2
Source reference: /affected/0/versions
1.6.0
Source reference: /affected/0/versions
1.6.1
Source reference: /affected/0/versions
1.6.2
Source reference: /affected/0/versions
1.7.0
Source reference: /affected/0/versions
1.7.1
Source reference: /affected/0/versions
1.8.0
Source reference: /affected/0/versions
1.9.0
Source reference: /affected/0/versions
1.9.1
Source reference: /affected/0/versions
1.9.2
Source reference: /affected/0/versions
1.9.3
Source reference: /affected/0/versions
Fixed versions: 1.10.2
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0.1.0"
          },
          {
            "fixed": "1.10.2"
          }
        ]
      }
    ],
    "package": {
      "name": "mint",
      "purl": "pkg:hex/mint",
      "ecosystem": "Hex"
    },
    "versions": [
      "0.1.0",
      "0.2.0",
      "0.2.1",
      "0.3.0",
      "0.4.0",
      "0.5.0",
      "1.0.0",
      "1.1.0",
      "1.10.0",
      "1.10.1",
      "1.2.0",
      "1.2.1",
      "1.3.0",
      "1.4.0",
      "1.4.1",
      "1.4.2",
      "1.5.0",
      "1.5.1",
      "1.5.2",
      "1.6.0",
      "1.6.1",
      "1.6.2",
      "1.7.0",
      "1.7.1",
      "1.8.0",
      "1.9.0",
      "1.9.1",
      "1.9.2",
      "1.9.3"
    ],
    "database_specific": {
      "source": "https://cna.erlef.org/osv/EEF-CVE-2026-94194.json"
    }
  },
  {
    "ranges": [
      {
        "repo": "https://github.com/elixir-mint/mint",
        "type": "GIT",
        "events": [
          {
            "introduced": "60089586ec7adc9fddb09f69a2f5919ba9ac7f33"
          },
          {
            "fixed": "2ec8b696b5475ecbdaa87c0098957bca339e17c0"
          },
          {
            "fixed": "8d1bbcfa566a8c1dc23d33f40d550c28250ac7b9"
          }
        ]
      }
    ],
    "versions": [
      "v1.10.1",
      "v1.10.0",
      "v1.9.3",
      "v1.9.2",
      "v1.9.1",
      "v1.9.0",
      "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://cna.erlef.org/osv/EEF-CVE-2026-94194.json"
    }
  }
]

Related CVEs: CVE-2026-94194
Source reference: /aliases

Publisher severity

No explicit severity was provided.

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-94194 · Medium

mint, mint

Event: #27676 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 07:29:26 GMT
Publisher date: Mon, 28 Sep 2026 11:15:30 GMT

Read the original announcement

Revision history

25 Oct 2026EEF-CVE-2026-94194 · Revision 1Source updated