Vulnerability-Lookup

GHSA-9344-F92H-VR44

Vulnerability from github – Published: 2026-05-06 18:30 – Updated: 2026-05-06 18:30

Details

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.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-42503"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1327"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T17:16:23Z",
    "severity": "HIGH"
  },
  "details": "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.\u00a0\nAs a result, users might\u00a0inadvertently cause gopls to bind 0.0.0.0.\nThis can allow a\u00a0malicious party on the same network to execute code arbitrarily via gopls.",
  "id": "GHSA-9344-f92h-vr44",
  "modified": "2026-05-06T18:30:31Z",
  "published": "2026-05-06T18:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42503"
    },
    {
      "type": "WEB",
      "url": "https://go.dev/cl/774381"
    },
    {
      "type": "WEB",
      "url": "https://go.dev/issue/79211"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-42503 (GCVE-0-2026-42503)

Vulnerability from cvelistv5 – Published: 2026-05-06 16:20 – Updated: 2026-05-07 03:55

Title

Accidental binding to INADDR_ANY might lead to RCE in golang.org/x/tools/gopls

Summary

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-06 00:00 UTC

CWE

CWE-1327 - Binding to an unrestricted IP address

Assigner

Go Google root Scorecard

References

2 references

URL	Tags
https://go.dev/issue/79211
https://go.dev/cl/774381

Impacted products

1 product

Vendor	Product	Version
golang.org/x/tools	golang.org/x/tools/gopls	Affected: 0.0.0 , < 0.22.0 (semver)

Date Public

2026-05-06 15:19

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "ADJACENT_NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-42503",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-06T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-07T03:55:49.730Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/tools/gopls",
          "product": "golang.org/x/tools/gopls",
          "vendor": "golang.org/x/tools",
          "versions": [
            {
              "lessThan": "0.22.0",
              "status": "affected",
              "version": "0.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "datePublic": "2026-05-06T15:19:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "gopls by default communicates via pipe. However, -port and -listen flags are supported as means of debugging.\u003cbr\u003eIf -listen is given a value without an explicit host (e.g. :8080), or -port is used, gopls will listen on 0.0.0.0.\u0026nbsp;\u003cbr\u003eAs a result, users might\u0026nbsp;inadvertently cause gopls to bind 0.0.0.0.\u003cbr\u003eThis can allow a\u0026nbsp;malicious party on the same network to execute code arbitrarily via gopls."
            }
          ],
          "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.\u00a0\nAs a result, users might\u00a0inadvertently cause gopls to bind 0.0.0.0.\nThis can allow a\u00a0malicious party on the same network to execute code arbitrarily via gopls."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1327",
              "description": "CWE-1327 Binding to an unrestricted IP address",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-06T16:20:01.428Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/79211"
        },
        {
          "url": "https://go.dev/cl/774381"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Accidental binding to INADDR_ANY might lead to RCE in golang.org/x/tools/gopls",
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-42503",
    "datePublished": "2026-05-06T16:20:01.428Z",
    "dateReserved": "2026-04-28T00:21:12.792Z",
    "dateUpdated": "2026-05-07T03:55:49.730Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

GHSA-9344-F92H-VR44

CVE-2026-42503 (GCVE-0-2026-42503)

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