jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output in RSA Operations
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-4603US | medium5.3 | — | ||
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… | ||||
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references
External citations — patches, advisories, analysis.
- https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3WEB
- https://github.com/kjur/jsrsasignPACKAGE
- https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93fWEB
- https://github.com/kjur/jsrsasign/pull/649WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-4603ADVISORY
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176WEB
scry
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