Bug 2571444 (CVE-2026-97035)

Summary: CVE-2026-97035 cmd/go: golang: cmd/go: arbitrary code execution via crafted cgo directives
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, cahl, crizzo, dfreiber, dpaolell, drow, dymurray, jburrell, jdelft, jupierce, kaycoth, lgarciaa, ljawale, mbiarnes, msilmser, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sdawley, sghai, sidsharm, suppawar, vkumar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in cmd/go. An attacker could achieve arbitrary code execution or write files to arbitrary locations by enticing a developer or automated build system to compile a crafted package. This vulnerability occurs when compiling packages that use cgo (Go's C-language interoperability feature), where overly broad compiler flag allowlists permit unexpected multi-argument options that desynchronize command argument parsing and inject unvalidated linker inputs.
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Description OSIDB Bzimport 2026-11-11 03:21:28 UTC 
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.