Unauthenticated code execution via wildcard listener
Published May 6, 2026 · Updated May 6, 2026
Unrestricted binding in The Go Project gopls before 0.22.0 allows remote attackers on the same network to execute arbitrary code. The -port flag and hostless -listen values such as :8080 cause the TCP listener to bind the LSP service to 0.0.0.0 rather than a named host. Exposure requires non-default debugging flags, but an unauthenticated network peer can then invoke gopls functionality with the user's privileges.
Summary
What happened
Unrestricted binding in The Go Project gopls before 0.22.0 allows remote attackers on the same network to execute arbitrary code. The -port flag and hostless -listen values such as :8080 cause the TCP listener to bind the LSP service to 0.0.0.0 rather than a named host. Exposure requires non-default debugging flags, but an unauthenticated network peer can then invoke gopls functionality with the user's privileges.
The record
- CVE
- CVE-2026-42503
- Published
- May 6, 2026
- Updated
- May 6, 2026
- Vendor
- The Go Project
- Product
- gopls
- Classifications
- CWE-1327, T1210
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 6, 2026CVE publishedPublication date reported by the CVE source.
- May 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.0 <0.22.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo