Medium severity5.9NVD Advisory· Published Mar 23, 2026· Updated Apr 29, 2026
CVE-2026-4603
CVE-2026-4603
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
jsrsasignnpm | < 11.1.1 | 11.1.1 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93fnvdPatchWEB
- gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3nvdExploitMitigationThird Party AdvisoryWEB
- github.com/advisories/GHSA-464q-cqxq-xhgrghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-4603ghsaADVISORY
- security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176nvdThird Party AdvisoryWEB
- github.com/kjur/jsrsasign/pull/649nvdIssue TrackingWEB
News mentions
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