Incorrect Conversion between Numeric Types Affecting jsrsasign package, versions <11.1.1
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
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Test your applications- Snyk IDSNYK-JS-JSRSASIGN-15371175
- published22 Mar 2026
- disclosed21 Feb 2026
- creditKr0emer
Introduced: 21 Feb 2026
NewCVE-2026-4602 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade jsrsasign to version 11.1.1 or higher.
Overview
jsrsasign is a free pure JavaScript cryptographic library.
Affected versions of this package are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.