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CVE-2026-42503

Estado: AnalizadaAlta (8.8)—

gopls by default communicates via pipe. However, -port and -listen flags are supported as means of debugging. If -listen is given a value without an explicit host (e.g. :8080), or -port is used, gopls will listen on 0.0.0.0.  As a result, users might inadvertently cause gopls to bind 0.0.0.0. This can allow a malicious party on the same network to execute code arbitrarily via gopls.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso a red adyacente (AV:A) sin privilegios previos; gopls escucha en 0.0.0.0 permitiendo RCE arbitrario. T1557 secundario por exposición a adversario en la red local.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Disable or Remove Feature or ProgramPrivileged Account ManagementNetwork SegmentationVulnerability ScanningUser TrainingThreat Intelligence Program

Tecnologías afectadas (1)

Golang — Gopls

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-42503",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-42503",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-06T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@golang.org",
      "affectedData": [
        {
          "vendor": "golang.org/x/tools",
          "product": "golang.org/x/tools/gopls",
          "versions": [
            {
              "status": "affected",
              "version": "0.0.0",
              "lessThan": "0.22.0",
              "versionType": "semver"
            }
          ],
          "packageName": "golang.org/x/tools/gopls",
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-05-06T17:16:23.417",
  "references": [
    {
      "url": "https://go.dev/cl/774381",
      "tags": [
        "Patch"
      ],
      "source": "security@golang.org"
    },
    {
      "url": "https://go.dev/issue/79211",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "source": "security@golang.org"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@golang.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1327"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "gopls by default communicates via pipe. However, -port and -listen flags are supported as means of debugging.\nIf -listen is given a value without an explicit host (e.g. :8080), or -port is used, gopls will listen on 0.0.0.0. \nAs a result, users might inadvertently cause gopls to bind 0.0.0.0.\nThis can allow a malicious party on the same network to execute code arbitrarily via gopls."
    }
  ],
  "lastModified": "2026-09-18T15:16:51.937",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:golang:gopls:*:*:*:*:*:go:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F76C2737-024A-4EA0-BDE4-3A6520098E8E",
              "versionEndExcluding": "0.22.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@golang.org"
}