VULNERABILITY INTELLIGENCE

CVE-2026-4603

CVSS score5.9 MEDIUM
EPSS probability0.10%
CISA KEVNot currently listed
Published2026-03-23
Last modified2026-06-22
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

Weakness classification

  • report@snyk.io: CWE-369

Primary references