Vulnerability-Lookup

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

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

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

To clipboard

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EUVD-2026-308865

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:08

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:08:49.960020+00:00",
  "id": "EUVD-2026-308865"
}

FKIE_CVE-2026-42503

Vulnerability from fkie_nvd - Published: 2026-05-06 17:16 - Updated: 2026-09-18 15:16

Severity

8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security@golang.org	https://go.dev/cl/774381	Patch
	security@golang.org	https://go.dev/issue/79211	Issue Tracking, Vendor Advisory

Impacted products

	Vendor	Product	Version
	golang	gopls	*

JSON

To clipboard

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    {
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GHSA-9344-F92H-VR44

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

Details

Severity

8.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "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"
  },
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  "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",
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    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

RHSA-2026:7385

Vulnerability from csaf_redhat - Published: 2026-04-10 14:24 - Updated: 2026-10-02 22:18

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

38 vulnerabilities in this advisory, including CVE-2026-42503.

CVE-2026-42503

A flaw was found in gopls. When started with -listen using a hostless address (for example :8080) or with -port, the language server binds to 0.0.0.0 instead of localhost, exposing the debug interface to the local network and allowing arbitrary code execution by a malicious party on the same network.

8.8 (High)


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

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:7385

Open the full advisory

RHSA-2026:8291

Vulnerability from csaf_redhat - Published: 2026-04-15 10:20 - Updated: 2026-10-01 23:35

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2026-42503.

CVE-2026-42503

8.8 (High)


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

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:8291

Open the full advisory

UBUNTU-CVE-2026-42503 (CVE-2026-42503)

Vulnerability from osv_ubuntu – Published: 2026-05-06 17:16 – Updated: 2026-05-20 15:27 – Source website

Details

Severity

8.8 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-42503	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-42503	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gopls",
            "binary_version": "2:0.16.1+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "gopls",
        "purl": "pkg:deb/ubuntu/gopls@2:0.16.1+ds-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.16.1+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gopls",
            "binary_version": "2:0.16.1+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "gopls",
        "purl": "pkg:deb/ubuntu/gopls@2:0.16.1+ds-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.16.1+ds-1"
      ]
    }
  ],
  "aliases": [],
  "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\u00a0inadvertently cause gopls to bind 0.0.0.0. This can allow a\u00a0malicious party on the same network to execute code arbitrarily via gopls.",
  "id": "UBUNTU-CVE-2026-42503",
  "modified": "2026-05-20T15:27:27Z",
  "published": "2026-05-06T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42503"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42503"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-42503"
  ]
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

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

EUVD-2026-308865

FKIE_CVE-2026-42503

GHSA-9344-F92H-VR44

RHSA-2026:7385

RHSA-2026:8291

UBUNTU-CVE-2026-42503 (CVE-2026-42503)

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Sightings

Nomenclature

Related by attack behaviour