jsPDF has HTML Injection in New Window paths

Answer in brief

CVE-2026-31938 records a Critical severity (CVSS 9.6) vulnerability in jsPDF has HTML Injection in New Window paths. The current sources do not mark it as known exploited. The current feed maps parallax/jsPDF (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 18, 2026Updated Sep 7, 2026Source checked Sep 19, 2026First seen by HOL Jul 15, 2026Material review Sep 7, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.6
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps parallax/jsPDF (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:parall:jspdf::::::node.js::*	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
parallax/jsPDFgeneric	< 4.2.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for parallax/jsPDF.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Mar 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 15, 2026

Sources and claim methodology

Upstream source description

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 [email protected]. As a workaround, sanitize user input before passing it to the output method.

Quoted source text, attributed separately from HOL analysis.