Vulnerability Report: GO-2026-4339

• CVE-2025-61731, CVE-2025-61731
• Affects: cmd/go
• Published: Jan 28, 2026

Building a malicious file with cmd/go can cause can cause a write to an attacker-controlled file with partial control of the file content. The "#cgo pkg-config:" directive in a Go source file provides command-line arguments to provide to the Go pkg-config command. An attacker can provide a "--log-file" argument to this directive, causing pkg-config to write to an attacker-controlled location.