QwikSec

Security Database

CVE

CWE

Training

CVE-2026-4603

Published: Mar 23, 2026

Modified: Mar 23, 2026

PUBLISHED

CVSS v3.1

5.9

MEDIUM

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.

Vendor	Product	Versions
n/a	jsrsasign	affected `0 - < 11.1.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

References

https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176

https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3

https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f

https://github.com/kjur/jsrsasign/pull/649

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