Arbitrary code execution during build on darwin via "-l to_library" in cgo in cmd/go

Arbitrary code execution during build on darwin via "-l to_library" in cgo in cmd/go

On Darwin, building a malicious package that uses cgo could cause arbitrary code execution when using the Apple linker due to passing "-l to_library <path>" in a "#cgo LDFLAGS" directive. The Apple linker recombines the separated arguments "-l" and "to_library" into "-lto_library", which loads an arbitrary LTO plugin dynamic library at link time. The go command now disallows "-l" followed by "to_library" in "#cgo LDFLAGS", rejects "-lazy_library", "-lazy_framework", "-load_hidden", "-library", and "-library-path", and checks recombined "-l" arguments against disallowed linker flags and patterns.

Source published

11 Nov 2026 03:13:16 UTC

Source modified

11 Nov 2026 03:13:16 UTC

Saved here

11 Nov 2026 04:25:37 UTC

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