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.

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Vendor Product Default status Versions
Go toolchain cmd/go unaffected
Version Status Constraints
0 affected < 1.26.11
1.27.0-0 affected < 1.27.4

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References
Link Providers
https://go.dev/cl/862149 cve-icon
https://go.dev/issue/82574 cve-icon
https://groups.google.com/g/golang-announce/c/iY8TY0wWgbM cve-icon
https://pkg.go.dev/vuln/GO-2026-6855 cve-icon
History

Wed, 11 Nov 2026 03:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Arbitrary code execution during build on darwin via "-l to_library" in cgo in cmd/go
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-11-11T03:13:16.347Z

Reserved: 2026-09-23T23:05:04.987Z

Link: CVE-2026-97036

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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