jsPDF has Shared State Race Condition in addJS Plugin

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.3 · 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 · score source

EPSS

• CVE-2026-24040: 0.28% estimated exploitation activity in the next 30 days; percentile 20.29 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact 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. Patches The vulnerability has been fixed in jspdf@4.0.1. The fix moves the shared variable into the function scope, ensuring isolation between instances. Workarounds Avoid using the addJS method in concurrent server-side environments. If usage is required, ensure requests are processed…

Published by the source

2 Feb 2026, 18:20 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 12:41 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-cjw8-79x6-5cj4

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-cjw8-79x6-5cj4

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# Patch Next advisory brief: CVE-2026-24040

Advisory: jsPDF has Shared State Race Condition in addJS Plugin
IDs: CVE-2026-24040, GHSA-cjw8-79x6-5cj4
Record: https://patchnext.com/advisories/cve-2026-24040 (revision 3, source checked 26 Oct 2026, 12:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: jspdf 4.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm jspdf: affected <= 4.0.0; fixed in 4.1.0

## Suggested inspection (read-only)
- `npm ls jspdf --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on jspdf.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-cjw8-79x6-5cj4 (OSV record GHSA-cjw8-79x6-5cj4 lists affected ranges: npm jspdf >=0 <4.1.0 (fixed))
- Verified: https://github.com/advisories/GHSA-cjw8-79x6-5cj4 (GitHub-reviewed advisory GHSA-cjw8-79x6-5cj4 lists affected ranges: npm jspdf >=0 <=4.0.0)

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