CVE-2026-27140

A flaw was found in the Go programming language (golang) and its command-line tool (cmd/go). A remote attacker could exploit this during the build process by crafting malicious SWIG (Simplified Wrapper and Interface Generator) file names that contain "cgo" and specific payloads. This could lead to code smuggling and arbitrary code execution, bypassing trust mechanisms and allowing the attacker to run unauthorized code.

This vulnerability is rated as Important because an attacker can achieve arbitrary code execution in the context of the user or build system compiling untrusted source code. Exploitation requires convincing a developer or automated CI/CD pipeline to build or download a malicious Go package containing specially crafted SWIG interface filenames. Pre-compiled binaries and production runtime environments that do not invoke the Go compiler toolchain remain unaffected.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.