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DEBIAN-CVE-2026-12143

Type: advisorySource: OSV1 source record

form-data is a library for creating readable multipart/form-data streams. In versions through 4.0.5, the `field` argument to `FormData#append` and the `filename` option are concatenated verbatim into the `Content-Disposition` header without escaping carriage return (CR), line feed (LF), or double-quote (") characters. An application that passes attacker-controlled data as a field name or filename (for example, an API gateway that turns JSON object keys into multipart field names) allows the attacker to terminate the header line and inject additional headers, or to smuggle entire additional multipart parts, into the request the application forwards to a backend. This can let the attacker add or override form fields (e.g. set `is_admin=true`) seen by the downstream parser. This is an instance of CWE-93 (CRLF injection). The fix escapes CR, LF, and `"` as `%0D`, `%0A`, and `%22` in field names and filenames, matching the serialization browsers use per the WHATWG HTML multipart/form-data encoding algorithm. Exploitation requires the consuming application to use untrusted input as a field name or filename; applications that use only fixed/trusted field names are not affected. Fixed in 2.5.6, 3.0.5, and 4.0.6.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-12143

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:DEBIAN-CVE-2026-12143

node-form-data

Source reference: /affected/0/package/name

Affected versions
4.0.0-1

Source reference: /affected/0/versions

4.0.0-1+deb12u1

Source reference: /affected/0/versions

4.0.1-1

Source reference: /affected/0/versions

4.0.1-2

Source reference: /affected/0/versions

4.0.4+~2.1.0-1

Source reference: /affected/0/versions

4.0.5+~2.1.0-1

Source reference: /affected/0/versions

4.0.6+~2.1.0-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

node-form-data

Source reference: /affected/1/package/name

Affected versions
4.0.1-2

Source reference: /affected/1/versions

4.0.4+~2.1.0-1

Source reference: /affected/1/versions

4.0.5+~2.1.0-1

Source reference: /affected/1/versions

4.0.6+~2.1.0-1

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

node-form-data

Source reference: /affected/2/package/name

Affected versions
4.0.1-2

Source reference: /affected/2/versions

4.0.4+~2.1.0-1

Source reference: /affected/2/versions

4.0.5+~2.1.0-1

Source reference: /affected/2/versions

Fixed versions
4.0.6+~2.1.0-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-form-data",
      "purl": "pkg:deb/debian/node-form-data?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "4.0.0-1",
      "4.0.0-1+deb12u1",
      "4.0.1-1",
      "4.0.1-2",
      "4.0.4+~2.1.0-1",
      "4.0.5+~2.1.0-1",
      "4.0.6+~2.1.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12143.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-form-data",
      "purl": "pkg:deb/debian/node-form-data?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "4.0.1-2",
      "4.0.4+~2.1.0-1",
      "4.0.5+~2.1.0-1",
      "4.0.6+~2.1.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12143.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.0.6+~2.1.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "node-form-data",
      "purl": "pkg:deb/debian/node-form-data?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "4.0.1-2",
      "4.0.4+~2.1.0-1",
      "4.0.5+~2.1.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12143.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#55467 · Revision 1
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Publisher date
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