When using Clang or GCC, building a malicious package that uses cgo could cause unexpected code execution at build time or write files to arbitrary directories via "-gen-*" or "-gnat*" flags in "#cgo" directives. The "-g*" wildcard in the compiler and linker flag allowlists previously matched Clang's two-argument "-gen-cdb-fragment-path <dir>" flag and GCC's two-argument "-gnatO <file>" flag, permitting compilation database fragments and sidecar output files to be written to arbitrary directories and desynchronizing flag argument parsing between the go command and the compiler driver so that subsequent arguments could be passed as unvalidated positional inputs to the linker. "-gen-*" and "-gnat*" flags are now disallowed in "#cgo" compiler and linker flags.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Go toolchain | cmd/go | unaffected |
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Fixes
Solution
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Workaround
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References
History
Wed, 11 Nov 2026 03:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | When using Clang or GCC, building a malicious package that uses cgo could cause unexpected code execution at build time or write files to arbitrary directories via "-gen-*" or "-gnat*" flags in "#cgo" directives. The "-g*" wildcard in the compiler and linker flag allowlists previously matched Clang's two-argument "-gen-cdb-fragment-path <dir>" flag and GCC's two-argument "-gnatO <file>" flag, permitting compilation database fragments and sidecar output files to be written to arbitrary directories and desynchronizing flag argument parsing between the go command and the compiler driver so that subsequent arguments could be passed as unvalidated positional inputs to the linker. "-gen-*" and "-gnat*" flags are now disallowed in "#cgo" compiler and linker flags. | |
| Title | Unexpected code execution and arbitrary file write via Clang -gen-* and GCC -gnat* flags in cgo in cmd/go | |
| References |
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Projects
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MITRE
Status: PUBLISHED
Assigner: Go
Published:
Updated: 2026-11-11T03:13:16.798Z
Reserved: 2026-09-23T23:05:04.987Z
Link: CVE-2026-97035
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-11-11T05:19:57.550
Modified: 2026-11-11T05:19:57.550
Link: CVE-2026-97035
Redhat
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OpenCVE Enrichment
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Weaknesses
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