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CVE-2026-42505

Estado: AnalizadaMedia (5.3)—

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Golang — GO

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-42505",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-42505",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-08T18:03:53.821942Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@golang.org",
      "affectedData": [
        {
          "vendor": "Go standard library",
          "product": "crypto/tls",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.25.12",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.26.0-0",
              "lessThan": "1.26.5",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.27.0-0",
              "lessThan": "1.27.0-rc.2",
              "versionType": "semver"
            }
          ],
          "packageName": "crypto/tls",
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "clientHelloMsg.marshalMsg"
            },
            {
              "name": "Conn.Handshake"
            },
            {
              "name": "Conn.HandshakeContext"
            },
            {
              "name": "Conn.Read"
            },
            {
              "name": "Conn.Write"
            },
            {
              "name": "Dial"
            },
            {
              "name": "DialWithDialer"
            },
            {
              "name": "Dialer.Dial"
            },
            {
              "name": "Dialer.DialContext"
            },
            {
              "name": "QUICConn.HandleData"
            },
            {
              "name": "QUICConn.SendSessionTicket"
            },
            {
              "name": "QUICConn.Start"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-07-08T17:17:21.497",
  "references": [
    {
      "url": "https://go.dev/cl/775960",
      "tags": [
        "Patch"
      ],
      "source": "security@golang.org"
    },
    {
      "url": "https://go.dev/issue/79282",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "security@golang.org"
    },
    {
      "url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc",
      "tags": [
        "Mailing List",
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "security@golang.org"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2026-5856",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@golang.org"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-201"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello."
    }
  ],
  "lastModified": "2026-09-16T20:14:44.473",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
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              "vulnerable": true,
              "matchCriteriaId": "B302AE7B-BC6D-484F-912F-711617651A1A",
              "versionEndExcluding": "1.25.12",
              "versionStartIncluding": "1.23.0"
            },
            {
              "criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "08CDCAED-0C22-42D9-97A8-77F19DEECDB2",
              "versionEndExcluding": "1.26.5",
              "versionStartIncluding": "1.26.0"
            },
            {
              "criteria": "cpe:2.3:a:golang:go:1.27:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1062DCC7-46FE-4CF5-ADEF-BEC03F8AB39E"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@golang.org"
}