Description

jsPDF has Shared State Race Condition in addJS Plugin

Impact

The addJS method in the jspdf Node.js build utilizes a shared module-scoped variable (text) to store JavaScript content. When used in a concurrent environment (e.g., a Node.js web server), this variable is shared across all requests.

If multiple requests generate PDFs simultaneously, the JavaScript content intended for one user may be overwritten by a subsequent request before the document is generated. This results in Cross-User Data Leakage, where the PDF generated for User A contains the JavaScript payload (and any embedded sensitive data) intended for User B.

Typically, this only affects server-side environments, although the same race conditions might occur if jsPDF runs client-side.

import { jsPDF } from "jspdf";

const docA = new jsPDF();
const docB = new jsPDF();

// 1. User A sets their script (stored in shared 'text' variable)
docA.addJS('console.log("Secret A");');
...
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Patches

The vulnerability has been fixed in [email protected]. The fix moves the shared variable into the function scope, ensuring isolation between instances.

Workarounds

Avoid using the addJS method in concurrent server-side environments. If usage is required, ensure requests are processed sequentially (e.g., using a queue) rather than in parallel.

Mitigation

Aliases

References