CVE-2026-4600

Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related DSA/X509 verification flow in src/dsa-2.0.js). An attacker can forge DSA signatures or X.509 certificates that X509.verifySignature() accepts by supplying malicious domain parameters such as g=1, y=1, and a fixed r=1, which make the verification equation true for any hash.

CVSS v3 7.4 HIGH

7.4^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7	Exploit Mitigation Third Party Advisory
https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef60	Patch
https://github.com/kjur/jsrsasign/pull/646	Issue Tracking
https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812268
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940	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-2026-4600
https://bugzilla.redhat.com/show_bug.cgi?id=2450208
https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7	Exploit Mitigation Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4600.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-2026-4600

Mitre link : CVE-2026-4600

CVE.ORG link : CVE-2026-4600

JSON object : View

Products Affected

kjur

jsrsasign

CWE

CWE-347

Improper Verification of Cryptographic Signature

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"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4600.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "report@snyk.io", "description": [{"lang": "en", "value": "CWE-347"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-347"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-347"}]}], "descriptions": [{"lang": "en", "value": "Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related DSA/X509 verification flow in src/dsa-2.0.js). An attacker can forge DSA signatures or X.509 certificates that X509.verifySignature() accepts by supplying malicious domain parameters such as g=1, y=1, and a fixed r=1, which make the verification equation true for any hash."}, {"lang": "es", "value": "Las versiones del paquete jsrsasign anteriores a la 11.1.1 son vulnerables a la Verificaci\u00f3n Incorrecta de Firma Criptogr\u00e1fica a trav\u00e9s de la validaci\u00f3n de par\u00e1metros de dominio DSA en KJUR.crypto.DSA.setPublic (y el flujo de verificaci\u00f3n DSA/X509 relacionado en src/dsa-2.0.js). Un atacante puede falsificar firmas DSA o certificados X.509 que X509.verifySignature() acepta al suministrar par\u00e1metros de dominio maliciosos como g=1, y=1, y un r=1 fijo, lo que hace que la ecuaci\u00f3n de verificaci\u00f3n sea verdadera para cualquier hash."}], "lastModified": "2026-09-10T13:20:22.247", "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"}