---
id: CVE-2026-42503
title: gopls by default communicates via pipe
summary: "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…"
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-1327
vendor: golang
product: gopls
affected:
  - gopls < 0.22.0
patched:
  - gopls 0.22.0
published: '2026-05-06'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T15:16:51.937'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42503'
references:
  - url: 'https://go.dev/cl/774381'
    label: security@golang.org
  - url: 'https://go.dev/issue/79211'
    label: security@golang.org
tags:
  - nvd
epss: 0.00349
epssPercentile: 0.25776
ingestedAt: '2026-09-18T15:44:31.553Z'
---

## Overview

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.

## Affected

- `gopls < 0.22.0`

## Remediation

Upgrade past the affected range:

- `gopls 0.22.0`