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CVE-2025-7783 is an insufficient-randomness vulnerability in the form-data package's multipart boundary generation. The package uses Math.random() to generate boundary values. When an attacker can observe pseudorandom generator outputs and control a request field, boundary prediction can enable multipart parameter injection and HTTP Parameter Pollution. Affected versions are earlier than 2.5.4, 3.0.0 through 3.0.3, and 4.0.0 through 4.0.3.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository demonstrates an exploit for CVE-2025-7783, a vulnerability in the randomness of form-data boundaries in Node.js applications. The exploit consists of several components: - 'backend.js' implements a backend server that receives user creation requests. - 'vulnerable-server.js' simulates a frontend server that forwards user input to the backend using form-data, with boundaries generated using Math.random(). - 'exploit.js' is the main exploit script. It collects random values from the vulnerable server, uses a Python script ('predict.py' with z3) to predict future random values, and crafts a form-data payload with a boundary that allows injection of an 'is_admin: true' parameter. This payload is sent to the vulnerable server, which unwittingly forwards it to the backend, resulting in privilege escalation. - The exploit requires both servers to be running locally and Python 3 with z3 installed. The attack vector is network-based, targeting HTTP endpoints on localhost. The exploit is operational and demonstrates a real privilege escalation scenario by exploiting predictable randomness in form-data boundaries.
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23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Axios-related vulnerability involving predictable boundary values in form-data, mentioned as part of vendor security history.
A high-risk vulnerability in form-data. Details on exploitation or impact are not provided in the content.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.