Description

Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.

INFO

Published Date :

2026-03-23T05:00:14.060Z

Last Modified :

2026-03-23T14:42:16.345Z

Source :

snyk
AFFECTED PRODUCTS

The following products are affected by CVE-2026-4603 vulnerability.

Vendors Products
Jsrsasign Project
  • Jsrsasign
Kjur
  • Jsrsasign
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-4603.

URL Resource
https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3 cve-icon cve-icon cve-icon
https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f cve-icon cve-icon cve-icon
https://github.com/kjur/jsrsasign/pull/649 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-4603 cve-icon
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176 cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-4603 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact