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FKIE_CVE-2026-4603

Vulnerability from fkie_nvd - Published: 2026-03-23 06:16 - Updated: 2026-06-22 03:18
Severity
5.9 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
5.3 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Summary
Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.
References
report@snyk.iohttps://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3Exploit, Mitigation, Third Party Advisory
report@snyk.iohttps://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93fPatch
report@snyk.iohttps://github.com/kjur/jsrsasign/pull/649Issue Tracking
report@snyk.iohttps://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176Third Party Advisory
Impacted products
Vendor Product Version
kjur jsrsasign *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "jsrsasign",
          "vendor": "n/a",
          "versions": [
            {
              "lessThan": "11.1.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "report@snyk.io"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:kjur:jsrsasign:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "46D62CE4-1F1B-44DF-BFAB-86FE57D7A194",
              "versionEndExcluding": "11.1.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide \u201cinvalid key\u201d errors by supplying a JWK whose modulus decodes to zero."
    },
    {
      "lang": "es",
      "value": "Versiones del paquete jsrsasign anteriores a la 11.1.1 son vulnerables a la divisi\u00f3n por cero debido a la ruta de an\u00e1lisis RSASetPublic/KEYUTIL en ext/rsa.js y la l\u00f3gica de reducci\u00f3n BigInteger.modPowInt en ext/jsbn.js. Un atacante puede forzar que las operaciones de clave p\u00fablica RSA (por ejemplo, verificar y cifrado) colapsen a salidas cero deterministas y ocultar errores de \u0027clave no v\u00e1lida\u0027 al proporcionar un JWK cuyo m\u00f3dulo se decodifica a cero."
    }
  ],
  "id": "CVE-2026-4603",
  "lastModified": "2026-06-22T03:18:31.867",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 3.4,
        "source": "report@snyk.io",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.0,
          "baseSeverity": "LOW",
          "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:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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": "LOW",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "report@snyk.io",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-4603",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-23T14:42:08.541897Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-23T06:16:22.233",
  "references": [
    {
      "source": "report@snyk.io",
      "tags": [
        "Exploit",
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/kjur/jsrsasign/pull/649"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176"
    }
  ],
  "sourceIdentifier": "report@snyk.io",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-369"
        }
      ],
      "source": "report@snyk.io",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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