MEDIUM5.9
GHSA-464q-cqxq-xhgr
jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output in RSA Operations
Quick fix
GHSA-464q-cqxq-xhgr — jsrsasign: upgrade to the fixed version with the command below.
npm install jsrsasign@11.1.1Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-4603[ADVISORY]
- https://github.com/kjur/jsrsasign/pull/649[WEB]
- https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f[WEB]
- https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3[WEB]
- https://github.com/kjur/jsrsasign[PACKAGE]
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176[WEB]