Jsdom is a popular npm package providing a JavaScript implementation of the W3C DOM, allowing developers to manipulate web pages within a Node.js environment for tasks like testing, scraping, and server-side rendering. Comparing version 0.3.0 against its predecessor, version 0.2.19, reveals subtle but potentially important changes for users.
Both versions share a similar core structure, relying on dependencies like cssom for CSS object model parsing, request for fetching external resources, cssstyle for inline style handling, contextify for providing a secure JavaScript execution environment (also listed under optionalDependencies), and htmlparser for parsing HTML. Development dependencies such as nodeunit for testing, optimist for command-line argument parsing, and console.log for debugging remain consistent.
The key difference lies in the introduction of nwmatcher as a dependency in version 0.3.0 with a version requirement of ">=1.3.0". nwmatcher is a fast CSS selector engine, suggesting improved CSS selector performance and accuracy in the newer version. While not explicitly stated, users upgrading from 0.2.19 to 0.3.0 might experience faster and more reliable CSS selection, especially in complex documents. Also, considering the release dates (October 27, 2012 for 0.2.19 and December 10, 2012 for 0.3.0) developers integrating jsdom should be aware of the dated dependencies and consider the potential implications of outdated packages when assesing their security needs.
All the vulnerabilities related to the version 0.3.0 of the package
Server-Side Request Forgery in Request
The request package through 2.88.2 for Node.js and the @cypress/request package prior to 3.0.0 allow a bypass of SSRF mitigations via an attacker-controller server that does a cross-protocol redirect (HTTP to HTTPS, or HTTPS to HTTP).
NOTE: The request package is no longer supported by the maintainer.
form-data uses unsafe random function in form-data for choosing boundary
form-data uses Math.random() to select a boundary value for multipart form-encoded data. This can lead to a security issue if an attacker:
Because the values of Math.random() are pseudo-random and predictable (see: https://blog.securityevaluators.com/hacking-the-javascript-lottery-80cc437e3b7f), an attacker who can observe a few sequential values can determine the state of the PRNG and predict future values, includes those used to generate form-data's boundary value. The allows the attacker to craft a value that contains a boundary value, allowing them to inject additional parameters into the request.
This is largely the same vulnerability as was recently found in undici by parrot409 -- I'm not affiliated with that researcher but want to give credit where credit is due! My PoC is largely based on their work.
The culprit is this line here: https://github.com/form-data/form-data/blob/426ba9ac440f95d1998dac9a5cd8d738043b048f/lib/form_data.js#L347
An attacker who is able to predict the output of Math.random() can predict this boundary value, and craft a payload that contains the boundary value, followed by another, fully attacker-controlled field. This is roughly equivalent to any sort of improper escaping vulnerability, with the caveat that the attacker must find a way to observe other Math.random() values generated by the application to solve for the state of the PRNG. However, Math.random() is used in all sorts of places that might be visible to an attacker (including by form-data itself, if the attacker can arrange for the vulnerable application to make a request to an attacker-controlled server using form-data, such as a user-controlled webhook -- the attacker could observe the boundary values from those requests to observe the Math.random() outputs). A common example would be a x-request-id header added by the server. These sorts of headers are often used for distributed tracing, to correlate errors across the frontend and backend. Math.random() is a fine place to get these sorts of IDs (in fact, opentelemetry uses Math.random for this purpose)
PoC here: https://github.com/benweissmann/CVE-2025-7783-poc
Instructions are in that repo. It's based on the PoC from https://hackerone.com/reports/2913312 but simplified somewhat; the vulnerable application has a more direct side-channel from which to observe Math.random() values (a separate endpoint that happens to include a randomly-generated request ID).
For an application to be vulnerable, it must:
form-data to send data including user-controlled data to some other system. The attacker must be able to do something malicious by adding extra parameters (that were not intended to be user-controlled) to this request. Depending on the target system's handling of repeated parameters, the attacker might be able to overwrite values in addition to appending values (some multipart form handlers deal with repeats by overwriting values instead of representing them as an array)If an application is vulnerable, this allows an attacker to make arbitrary requests to internal systems.
tough-cookie Prototype Pollution vulnerability
Versions of the package tough-cookie before 4.1.3 are vulnerable to Prototype Pollution due to improper handling of Cookies when using CookieJar in rejectPublicSuffixes=false mode. This issue arises from the manner in which the objects are initialized.