{"id":"GO-2026-6850","summary":"Host linker flag injection via //go:cgo_* directives in cmd/compile and cmd/link","details":"Building a malicious package containing \"//go:cgo_*\" compiler directives could inject arbitrary flags into the external linker invocation on ELF platforms.\n\nThe compiler and linker did not reject commas in \"//go:cgo_import_dynamic\", \"//go:cgo_export_dynamic\", \"//go:cgo_export_static\", \"//go:cgo_import_static\", and \"//go:cgo_dynamic_linker\" directives, and the linker passed the dynamic linker path using \"-Wl,--dynamic-linker,\u003cpath\u003e\". Furthermore, the two-argument form of \"//go:cgo_import_dynamic\" (which is permitted in non-cgo Go source files) could overwrite the external symbol name of a symbol already marked for cgo export. A symbol name or dynamic linker path containing a comma or leading \"@\" could split \"-Wl,--export-dynamic-symbol=\" or \"-Wl,--dynamic-linker,\" into arbitrary host linker flags or response file arguments.\n\nThe compiler and linker now reject commas in \"//go:cgo_*\" symbol and dynamic linker directives, the linker passes \"-Wl,--dynamic-linker=\u003cpath\u003e\", and \"cgo_import_dynamic\" no longer overwrites symbols exported via \"cgo_export_dynamic\" or \"cgo_export_static\".","aliases":["CVE-2026-97041"],"modified":"2026-11-11T03:15:14.803931428Z","published":"2026-11-11T02:51:11Z","database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-6850"},"references":[{"type":"FIX","url":"https://go.dev/cl/862154"},{"type":"REPORT","url":"https://go.dev/issue/82569"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/iY8TY0wWgbM"}],"affected":[{"package":{"name":"toolchain","ecosystem":"Go","purl":"pkg:golang/toolchain"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.26.11"},{"introduced":"1.27.0-0"},{"fixed":"1.27.4"}]}],"ecosystem_specific":{"imports":[{"path":"cmd/compile"},{"path":"cmd/link"}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-6850.json"}}],"schema_version":"1.9.2","credits":[{"name":"RyotaK (https://ryotak.net) of GMO Flatt Security Inc."}]}