Bug 2467285 (CVE-2026-42503)

Summary: CVE-2026-42503 golang: golang.org/x/tools/gopls: gopls: Arbitrary code execution due to insecure network binding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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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.
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Description OSIDB Bzimport 2026-05-06 17:01:33 UTC 
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.