CVE-2026-4258

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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."}], "id": "CVE-2026-4258", "lastModified": "2026-07-28T16:18:22.213", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "report@snyk.io", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "report@snyk.io", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4258", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-17T13:22:02.709429Z", "version": "2.0.3"}}]}, "published": "2026-03-17T06:16:18.590", "references": [{"source": "report@snyk.io", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47"}, {"source": "report@snyk.io", "tags": ["Broken Link"], "url": "https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461"}, {"source": "report@snyk.io", "tags": ["Patch"], "url": "https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796"}, {"source": "report@snyk.io", "url": "https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15751243"}, {"source": "report@snyk.io", "tags": ["Exploit", "Third Party Advisory"], "url": "https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"], "url": "https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617"}], "sourceIdentifier": "report@snyk.io", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "report@snyk.io", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-325"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

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