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High severity7.5NVD Advisory· Published Jun 12, 2026· Updated Jun 16, 2026

CVE-2026-12143

CVE-2026-12143

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
form-datanpm
< 2.5.62.5.6
form-datanpm
>= 3.0.0, < 3.0.53.0.5
form-datanpm
>= 4.0.0, < 4.0.64.0.6

Affected products

121

Patches

Vulnerability mechanics

References

9

News mentions

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