CVE-2026-76234

{
  "id": "CVE-2026-76234",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-19T14:17:52.797",
  "lastModified": "2026-10-27T13:10:00.360",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libcrux-ecdh and libcrux-ed25519 before 0.0.6, and libcrux-psq before 0.0.7, contain cryptographic implementation bugs. libcrux-ecdh did not properly check length and clamping during X25519 secret validation (and had a broken clamping check for imported X25519 secret keys); libcrux-ed25519 performed a duplicated clamping step during key generation; and libcrux-psq panicked instead of propagating an AEADError. These were fixed in the respective patched releases."
    },
    {
      "lang": "es",
      "value": "libcrux-ecdh y libcrux-ed25519 anteriores a 0.0.6, y libcrux-psq anteriores a 0.0.7, contienen errores de implementación criptográfica. libcrux-ecdh no verificaba correctamente la longitud y el clamping durante la validación de secretos X25519 (y tenía una verificación de clamping defectuosa para claves secretas X25519 importadas); libcrux-ed25519 realizaba un paso de clamping duplicado durante la generación de claves; y libcrux-psq entraba en pánico en lugar de propagar un AEADError. Estos fueron corregidos en las respectivas versiones parcheadas."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "celabshq",
          "product": "libcrux-ecdh",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:cargo/libcrux-ecdh",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.0.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "0.0.6",
              "versionType": "semver",
              "status": "unaffected"
            }
          ]
        },
        {
          "vendor": "celabshq",
          "product": "libcrux-ed25519",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:cargo/libcrux-ed25519",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.0.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "0.0.6",
              "versionType": "semver",
              "status": "unaffected"
            }
          ]
        },
        {
          "vendor": "celabshq",
          "product": "libcrux-psq",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:cargo/libcrux-psq",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.0.7",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "0.0.7",
              "versionType": "semver",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-20T13:48:17.831964Z",
          "id": "CVE-2026-76234",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/celabshq/libcrux/security/advisories/GHSA-435g-fcv3-8j26",
      "source": "[email protected]"
    },
    {
      "url": "https://www.vulncheck.com/advisories/libcrux-before-cryptographic-implementation-bug-fixes",
      "source": "[email protected]"
    }
  ]
}