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 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.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 3.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3	Exploit Mitigation Third Party Advisory
https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f	Patch
https://github.com/kjur/jsrsasign/pull/649	Issue Tracking
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:jsrsasign_project:jsrsasign:*:*:*:*:*:node.js:*:*

History

23 Mar 2026, 16:08

Type	Values Removed	Values Added
CPE		cpe:2.3:a:jsrsasign_project:jsrsasign::::::node.js::*
References	~~() https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3 -~~	() https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3 - Exploit, Mitigation, Third Party Advisory
References	~~() https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f -~~	() https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f - Patch
References	~~() https://github.com/kjur/jsrsasign/pull/649 -~~	() https://github.com/kjur/jsrsasign/pull/649 - Issue Tracking
References	~~() https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176 -~~	() https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176 - Third Party Advisory
First Time		Jsrsasign Project Jsrsasign Project jsrsasign

23 Mar 2026, 06:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-23 06:16

Updated : 2026-03-23 16:08

NVD link : CVE-2026-4603

Mitre link : CVE-2026-4603

CVE.ORG link : CVE-2026-4603

JSON object : View

Products Affected

jsrsasign_project

jsrsasign

CWE

CWE-369

Divide By Zero

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