parallax jsPDF up to 4.1.x Acroform escape output

Summaryinfo

A vulnerability, which was classified as critical, was found in parallax jsPDF up to 4.1.x. The impacted element is an unknown function of the component Acroform Module. Executing a manipulation can lead to escape output. This vulnerability is handled as CVE-2026-25940. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in parallax jsPDF up to 4.1.x and classified as critical. This vulnerability affects some unknown functionality of the component Acroform Module. The manipulation with an unknown input leads to a escape output vulnerability. The CWE definition for the vulnerability is CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

jsPDF is a library to generate PDFs in JavaScript. Prior to 4.2.0, user control of properties and methods of the Acroform module allows users to inject arbitrary PDF objects, such as JavaScript actions. If given the possibility to pass unsanitized input to one of the following property, a user can inject arbitrary PDF objects, such as JavaScript actions, which are executed when the victim hovers over the radio option. The vulnerability has been fixed in [email protected]. As a workaround, sanitize user input before passing it to the vulnerable API members.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-25940 since 02/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 4.2.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 71ad2dbfa6c7c189ab42b855b782620fa8a38375 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• parallax

Name

• jsPDF

Version

• 4.0
• 4.1

License

• open-source

Website

• Product: https://github.com/parallax/jsPDF/

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