medium5.9
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 BigIntege…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | jsrsasign | < 11.1.1 | 11.1.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Kjur | Jsrsasign | before 11.1.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-464q-cqxq-xhgr
- https://nvd.nist.gov/vuln/detail/CVE-2026-4603
- https://github.com/kjur/jsrsasign/pull/649
- https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f
- https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176