CVE-2025-7783: form-data Library HPP Vulnerability

CVE-2025-7783 Overview

Use of Insufficiently Random Values vulnerability in form-data allows HTTP Parameter Pollution (HPP). This vulnerability is associated with program files lib/form_data.js.

This issue affects form-data: < 2.5.4, 3.0.0 - 3.0.3, 4.0.0 - 4.0.3.

Critical Impact

An attacker could exploit this vulnerability to inject malicious parameters into HTTP requests, potentially causing unexpected behavior on the server-side.

Affected Products

• form-data < 2.5.4
• form-data 3.0.0 - 3.0.3
• form-data 4.0.0 - 4.0.3

Discovery Timeline

• Not Available - Vulnerability discovered by Not Available
• Not Available - Responsible disclosure to Not Available
• Not Available - CVE CVE-2025-7783 assigned
• Not Available - Not Available releases security patch
• 2025-07-18 - CVE CVE-2025-7783 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-7783

Vulnerability Analysis

The vulnerability arises from the use of insufficiently random values in the construction of HTTP requests. Specifically, the lack of randomness allows attackers to perform HTTP Parameter Pollution (HPP) by injecting crafted parameters into a request, potentially manipulating how the server processes the request.

Root Cause

The root cause is the use of predictable sequences in generating parameter values, which can be easily guessed or manipulated by attackers, thus compromising the integrity of HTTP requests.

Attack Vector

This vulnerability can be exploited remotely over a network by crafting specially designed HTTP requests that target the affected form-data package versions.

// Example exploitation code (sanitized)
fetch("http://vulnerable.server/upload", {
  method: "POST",
  body: new FormData({ key: "value", extra: "malicious" })
});

Detection Methods for CVE-2025-7783

Indicators of Compromise

• Unexpected parameters in HTTP request logs
• Abnormal server responses to routine requests
• Increased error or exception logs related to HTTP parsing

Detection Strategies

Monitoring incoming HTTP requests for unexpected or repeated parameter names. Utilizing web application firewalls (WAF) to identify and block malformed requests suggestive of HPP attacks.

Monitoring Recommendations

Implement HTTP log analysis to identify irregularities in request patterns. Use tools like OWASP ZAP or Burp Suite to simulate HPP attacks and ensure detection capabilities are effective.

How to Mitigate CVE-2025-7783

Immediate Actions Required

• Ensure input validation checks are in place
• Update form-data package to a secured version above 4.0.3
• Implement server-side checks for duplicate parameter names

Patch Information

Upgrading to the latest version of the form-data library will resolve this issue. The patch is available through the form-data repository.

Workarounds

Until a full update can be performed, implementing strict input validation and sanitization can help mitigate the risk of exploitation.

# Configuration example for input validation
if [ "${PARAM_VALUES}" != "`echo ${PARAM_VALUES} | sed 's/[^a-zA-Z0-9]//g'`" ]; then
  echo "Invalid characters detected"
fi