form-data: CRLF injection in form-data via unescaped multipart field names and filenames

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0067, the 52nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 12 Jun 2026, 18:00 UTC Published by the maintainers as a GitHub repository advisory

Sources

• GitHub Advisory Database: GHSA-hmw2-7cc7-3qxx
• OSV: GHSA-hmw2-7cc7-3qxx
• github.com/form-data/form-data/security/advisories/GHSA-hmw2-7cc7-3qxx
• nvd.nist.gov/vuln/detail/CVE-2026-12143
• github.com/form-data/form-data/commit/64190db548c0179e37206858e39f27cf513e9435
• github.com/form-data/form-data/commit/be3f3cf553978bac15a5182f1f3c3d2d38ccf229
• github.com/form-data/form-data/commit/c7133499c2ee1b80c678e411244f4442bf902045
• github.com/form-data/form-data
• html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data
• www.npmjs.com/package/form-data

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.