Node.js CVE-2026-24040
MEDIUM
GHSA-cjw8-79x6-5cj4
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
4Blast Radius
ecosystem impact- 4 npm packages depend on jspdf (2 direct, 2 indirect)
Ecosystem-wide dependent count for version 4.1.0.
DescriptionGitHub Advisory
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.
AnalysisAI
jsPDF versions prior to 4.1.0 contain a race condition in the addJS method where a shared module-scoped variable is overwritten during concurrent PDF generation, causing JavaScript payloads and embedded data intended for one user to be included in another user's generated PDF. This cross-user data leakage primarily affects server-side Node.js deployments handling simultaneous requests, allowing attackers to access sensitive information leaked across user sessions. Public exploit code exists for this vulnerability.
Technical ContextAI
Classified as CWE-362 (Race Condition). Affects Jspdf. 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
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
View allVendor StatusVendor
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External POC / Exploit Code
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