CVE-2026-24040: Jspdf JsPDF Has Shared State Race Vulnerability

MODERATE
Advisory Identifier: GHSA-cjw8-79x6-5cj4
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CWE-362 CWE-200
Published
Advisory Summary

CVE-2026-24040 is a MODERATE jspdf has shared state race vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Jspdf libraries in the npm ecosystem. The issue involves jspdf has shared state race condition in addjs plugin. Remediation is available by upgrading affected packages to version 4.1.0.

CVE-2026-24040 at a Glance

CVE Identifier CVE-2026-24040
GHSA Identifier GHSA-cjw8-79x6-5cj4
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Jspdf
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-24040

To remediate this vulnerability, upgrade all affected Jspdf dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

jspdf fixed: 4.1.0 
npm install jspdf@4.1.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls jspdf

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-24040, inspect your project dependencies using npm:

npm ls jspdf

Analyze the terminal output to locate any version of Jspdf in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.1.0), your application is affected.

Note: The npm ls jspdf command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In Jspdf, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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. ```js import { jsPDF } from "jspdf"; const docA = new jsPDF(); const docB = new jsPDF(); // 1. User A sets their script (stored in shared 'text' variable) docA.addJS('console.log("Secret A");'); // 2. User B sets their script (overwrites shared 'text' variable) docB.addJS('console.log("Secret B");'); // 3. User A saves their PDF (reads current 'text' variable) docA.save("userA.pdf"); // Result: userA.pdf contains "Secret B" instead of "Secret A" ``` ### 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 sequentially (e.g., using a queue) rather than in parallel.

CVE-2026-24040 Affected Jspdf Versions

1 component(s)
Fixed Versions:
4.1.0
Product / Package Ecosystem Affected Versions Fixed Version
jspdf
npm/jspdf
npm
< 4.1.0
4.1.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/parallax/jsPDF/security/advisories/GHSA-cjw8-79x6-5cj4
NVD — CVE-2026-24040 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-24040
Security Fix Commit FIX COMMIT
https://github.com/parallax/jsPDF/commit/2863e5c26afef211a545e8c174ab4d5fce3b8c0e
Jspdf Source Repository REPOSITORY
https://github.com/parallax/jsPDF
Jspdf Release RELEASE
https://github.com/parallax/jsPDF/releases/tag/v4.1.0

Frequently Asked Questions

What is CVE-2026-24040?
CVE-2026-24040 is a security vulnerability in Jspdf involving jsPDF has Shared State Race Condition in addJS Plugin under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Jspdf versions are affected?
Affected versions include releases prior to 4.1.0 across affected packages: jspdf.
What version fixes CVE-2026-24040?
Upgrading to 4.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jspdf affected?
Yes, jspdf is affected in releases prior to 4.1.0. Upgrade your dependency to 4.1.0 or later.
What CWE is associated with CVE-2026-24040?
CVE-2026-24040 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check npm dependencies for CVE-2026-24040?
Run the dependency tree command: 'npm ls jspdf'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-cjw8-79x6-5cj4",
  "modified" : "2026-02-03T16:12:26Z",
  "published" : "2026-02-02T18:20:02Z",
  "aliases" : [ "CVE-2026-24040" ],
  "summary" : "jsPDF has Shared State Race Condition in addJS Plugin",
  "details" : "### Impact\n\nThe 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.\n\nIf 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.\n\nTypically, this only affects server-side environments, although the same race conditions might occur if jsPDF runs client-side.\n\n```js\nimport { jsPDF } from \"jspdf\";\n\nconst docA = new jsPDF();\nconst docB = new jsPDF();\n\n// 1. User A sets their script (stored in shared 'text' variable)\ndocA.addJS('console.log(\"Secret A\");');\n\n// 2. User B sets their script (overwrites shared 'text' variable)\ndocB.addJS('console.log(\"Secret B\");');\n\n// 3. User A saves their PDF (reads current 'text' variable)\ndocA.save(\"userA.pdf\");\n\n// Result: userA.pdf contains \"Secret B\" instead of \"Secret A\"\n```\n\n### Patches\nThe vulnerability has been fixed in jspdf@4.0.1. The fix moves the shared variable into the function scope, ensuring isolation between instances.\n\n### Workarounds\nAvoid using the addJS method in concurrent server-side environments. If usage is required, ensure requests are processed sequentially (e.g., using a queue) rather than in parallel.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "jspdf"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.1.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.0.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/parallax/jsPDF/security/advisories/GHSA-cjw8-79x6-5cj4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-24040"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parallax/jsPDF/commit/2863e5c26afef211a545e8c174ab4d5fce3b8c0e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/parallax/jsPDF"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parallax/jsPDF/releases/tag/v4.1.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-362" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-02T18:20:02Z",
    "nvd_published_at" : "2026-02-02T23:16:07Z"
  }
}