CVE-2026-4603

MediumCVSS 5.3/10Last modified Jun 22, 2026

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Weakness enumeration

CWE-369

Affected software

No affected versions have been published.

Timeline

Published
Mar 23, 2026
Last modified
Jun 22, 2026
NVD status
Analyzed

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CVE-2026-4603: Medium severity, CVSS 5.3 | Vulnix