CVE-2026-4258

Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.

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 HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47	Exploit Mitigation Third Party Advisory
https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461	Broken Link
https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796	Patch
https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15751243
https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617	Exploit Third Party Advisory
https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47	Exploit Mitigation Third Party Advisory
https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:bitwiseshiftleft:stanford_javascript_crypto_library:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-03-17 06:16

Updated : 2026-07-28 16:18

NVD link : CVE-2026-4258

Mitre link : CVE-2026-4258

CVE.ORG link : CVE-2026-4258

JSON object : View

Products Affected

bitwiseshiftleft

stanford_javascript_crypto_library

CWE

CWE-347

Improper Verification of Cryptographic Signature

CWE-325

Missing Cryptographic Step

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An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback."}, {"lang": "es", "value": "Todas las versiones del paquete sjcl son vulnerables a la Verificaci\u00f3n Incorrecta de Firma Criptogr\u00e1fica debido a la falta de validaci\u00f3n de punto en curva en sjcl.ecc.basicKey.publicKey(). Un atacante puede recuperar la clave privada ECDH de una v\u00edctima enviando claves p\u00fablicas fuera de curva manipuladas y observando las salidas ECDH. La funci\u00f3n dhJavaEc() devuelve directamente la coordenada x sin procesar del resultado de la multiplicaci\u00f3n escalar (sin hashing), proporcionando un or\u00e1culo de texto plano sin requerir ninguna retroalimentaci\u00f3n de descifrado."}], "lastModified": "2026-07-28T16:18:22.213", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:bitwiseshiftleft:stanford_javascript_crypto_library:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "2047B9DC-A7EE-46A6-A484-066411066757", "versionEndIncluding": "1.0.8"}], "operator": "OR"}]}], "sourceIdentifier": "report@snyk.io"}