CVE-2026-4603
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.
- Score
- CVSS 3.1 5.9 Medium
- Status
- Analyzed - report@snyk.io
- Published
- 2026-03-23
- Last modified
- 2026-03-23
- Weaknesses
- CWE-369
Affected products
References
- https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3
- https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f
- https://github.com/kjur/jsrsasign/pull/649
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176
