jsPDF is a library to generate PDFs in JavaScript. Prior to 4.2.0, user control of the argument of the `addJS` method allows an attacker to inject arbitrary PDF objects into the generated document. By crafting a payload that escapes the JavaScript string delimiter, an attacker can execute malicious actions or alter the document structure, impacting any user who opens the generated PDF. The vulnerability has been fixed in jspdf@4.2.0. As a workaround, escape parentheses in user-provided JavaScript code before passing them to the `addJS` method.

Affected: npm: jspdf

### Impact

User control of the argument of the `addJS` method allows an attacker to inject arbitrary PDF objects into the generated document. By crafting a payload that escapes the JavaScript string delimiter, an attacker can execute malicious actions or alter the document structure, impacting any user who opens the generated PDF.

```js import { jsPDF } from "jspdf"; const doc = new jsPDF(); // Payload: // 1. ) closes the JS string. // 2. > closes the current dictionary. // 3. /AA ... injects an "Additional Action" that executes on focus/open. const maliciousPayload = "console.log('test');) >> /AA << /O << /S /JavaScript /JS (app.alert('Hacked!')) >> >>";

doc.addJS(maliciousPayload); doc.save("vulnerable.pdf"); ```

### Patches The vulnerability has been fixed in jspdf@4.2.0.

### Workarounds Escape parentheses in user-provided JavaScript code before passing them to the `addJS` method. ### References https://github.com/ZeroXJacks/CVEs/blob/main/2026/CVE-2026-25755.md

fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug jsPDF: denial of service via malicious GIF dimensions jsPDF: PDF object injection via unsanitized input in addJS method fast-xml-parser: fast-xml-parser: Cross-Site Scripting (XSS) due to improper DOCTYPE entity handling jsPDF: PDF injection in AcroForm module allows arbitrary JavaScript execution (RadioButton children) fast-xml-parser: fast-xml-parser: Denial of Service via unlimited XML entity expansion fast-xml-parser: fast-xml-parser: Stack overflow leads to Denial of Service svgo: SVGO: Denial of Service via XML entity expansion jspdf: jsPDF: Arbitrary code execution via unsanitized input in createAnnotation method jspdf: jsPDF: Cross site scripting via unsanitized output options fast-xml-parser: fast-xml-parser: Denial of Service via XML entity expansion bypass google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation

Ein Angreifer kann mehrere Schwachstellen in Splunk SOAR ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen SQL-Injection Angriff durchzuführen, um einen Cross-Site Scripting Angriff durchzuführen, und um beliebigen Programmcode auszuführen.