Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Parall | Jspdf | < 4.2.1 |
Related Weaknesses (CWE)
References
- https://github.com/parallax/jsPDF/commit/87a40bbd07e6b30575196370670b41f264aa78dPatch
- https://github.com/parallax/jsPDF/releases/tag/v4.2.1ProductRelease Notes
- https://github.com/parallax/jsPDF/security/advisories/GHSA-wfv2-pwc8-crg5MitigationVendor Advisory
FAQ
What is CVE-2026-31938?
CVE-2026-31938 is a vulnerability with a CVSS score of 9.6 (CRITICAL). 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) i...
How severe is CVE-2026-31938?
CVE-2026-31938 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-31938?
Check the references section above for vendor advisories and patch information. Affected products include: Parall Jspdf.