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-JAVA-ORGWEBJARSNPM-15812274
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175	Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19375
https://access.redhat.com/errata/RHSA-2026:19409
https://access.redhat.com/errata/RHSA-2026:19410
https://access.redhat.com/errata/RHSA-2026:6568
https://access.redhat.com/errata/RHSA-2026:6720
https://access.redhat.com/errata/RHSA-2026:6912
https://access.redhat.com/errata/RHSA-2026:6926
https://access.redhat.com/security/cve/CVE-2026-4602
https://bugzilla.redhat.com/show_bug.cgi?id=2450206
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4602.json

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2026-03-23 06:16

Updated : 2026-09-10 13:20

NVD link : CVE-2026-4602

Mitre link : CVE-2026-4602

CVE.ORG link : CVE-2026-4602

JSON object : View

Products Affected

kjur

jsrsasign

CWE

CWE-681

Incorrect Conversion between Numeric Types

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"value": "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."}, {"lang": "es", "value": "Las versiones del paquete jsrsasign anteriores a la 11.1.1 son vulnerables a Conversi\u00f3n Incorrecta entre Tipos Num\u00e9ricos debido al manejo de exponentes negativos en ext/jsbn2.js. Un atacante puede forzar el c\u00e1lculo de inversas modulares incorrectas y romper la verificaci\u00f3n de firmas al llamar a modPow con un exponente negativo."}], "lastModified": "2026-09-10T13:20:22.877", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:kjur:jsrsasign:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "46D62CE4-1F1B-44DF-BFAB-86FE57D7A194", "versionEndExcluding": "11.1.1"}], "operator": "OR"}]}], "sourceIdentifier": "report@snyk.io"}