---
id: CVE-2026-31938
title: jsPDF is a library to generate PDFs in JavaScript
summary: >-
  jsPDF is a library to generate PDFs in JavaScript. Prior to version 4.2.1,
  user control of the `options` argument of the `output` function allows
  attackers to inject arbitrary HTML (such as scripts) into the browser context
  the created P…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L'
cwe:
  - CWE-79
  - CWE-79
vendor: parall
product: jspdf
affected:
  - jspdf < 4.2.1
patched:
  - jspdf 4.2.1
published: '2026-03-18'
updated: '2026-07-20'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-31938'
references:
  - url: >-
      https://github.com/parallax/jsPDF/commit/87a40bbd07e6b30575196370670b41f264aa78d7
    label: security-advisories@github.com
  - url: 'https://github.com/parallax/jsPDF/releases/tag/v4.2.1'
    label: security-advisories@github.com
  - url: 'https://github.com/parallax/jsPDF/security/advisories/GHSA-wfv2-pwc8-crg5'
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:7110'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:7128'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-31938'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2448550'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31938.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00404
epssPercentile: 0.31922
ingestedAt: '2026-07-20T12:38:40.594Z'
---

## Overview

jsPDF is a library to generate PDFs in JavaScript. Prior to version 4.2.1, user control of the `options` argument of the `output` function allows attackers to inject arbitrary HTML (such as scripts) into the browser context the created PDF is opened in. The vulnerability can be exploited in the following scenario: the attacker provides values for the output options, for example via a web interface. These values are then passed unsanitized (automatically or semi-automatically) to the attack victim. The victim creates and opens a PDF with the attack vector using one of the vulnerable method overloads inside their browser. The attacker can thus inject scripts that run in the victims browser context and can extract or modify secrets from this context. The vulnerability has been fixed in jspdf@4.2.1. As a workaround, sanitize user input before passing it to the output method.

## Affected

- `jspdf < 4.2.1`

## Remediation

Upgrade past the affected range:

- `jspdf 4.2.1`