CVE-2026-4603
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
Versions of the jsrsasign package before 11.1.1 are vulnerable to division by zero, potentially leading to incorrect RSA public-key operations. An attacker can force these operations to return predetermined zero outputs, hiding 'invalid key' errors.
Risk Assessment
The organization may be exposed to attacks exploiting this vulnerability to deceive cryptographic operations, potentially leading to data integrity loss and diminished trust in the system.
Recommendation
It is recommended to update the jsrsasign package to version 11.1.1 or later to mitigate this vulnerability.
Original NVD description (English source)
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.