CVE-2026-4602

Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5	Exploit Mitigation Third Party Advisory
https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195	Patch
https://github.com/kjur/jsrsasign/pull/650	Issue Tracking
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175	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
References	~~() https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5 -~~	() https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5 - Exploit, Mitigation, Third Party Advisory
References	~~() https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195 -~~	() https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195 - Patch
References	~~() https://github.com/kjur/jsrsasign/pull/650 -~~	() https://github.com/kjur/jsrsasign/pull/650 - Issue Tracking
References	~~() https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175 -~~	() https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175 - Third Party Advisory
First Time		Jsrsasign Project Jsrsasign Project jsrsasign
CPE		cpe:2.3:a:jsrsasign_project:jsrsasign::::::node.js::*

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-2026-4602

Mitre link : CVE-2026-4602

CVE.ORG link : CVE-2026-4602

JSON object : View

Products Affected

jsrsasign_project

jsrsasign

CWE

CWE-681

Incorrect Conversion between Numeric Types

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