Bug 2571453 (CVE-2026-97042)

Summary:	CVE-2026-97042 cmd/cgo: cmd/compile: cmd/link: golang: Go: Arbitrary code execution via unsafe linker arguments on Windows
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	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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Doc Text:	A flaw was found in the Go toolchain. An attacker could achieve arbitrary code execution by convincing a user or automated system to build a malicious package containing crafted dynamic import directives or Portable Executable (PE) object files on Windows. Due to insufficient validation of imported dynamic-link library (DLL) names, unsafe arguments containing directory traversal sequences are passed to the external linker, allowing the build process to reference or load arbitrary files on disk.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-11-11 03:22:03 UTC

Building a malicious package that uses "//go:cgo_import_dynamic" or links against a crafted PE object on Windows could pass unsafe library arguments to the external linker. The compiler only checked the first character of the library name in "//go:cgo_import_dynamic" directives and skipped validation in cgo-generated files. In addition, on Windows, "cmd/cgo" and "cmd/link" did not validate imported DLL names extracted from PE object files before emitting "-l<name>" flags for the external linker, allowing a crafted DLL name containing ".." path traversal or special characters to reference arbitrary files on disk. The compiler now validates every character of the library name in "//go:cgo_import_dynamic" directives (including in cgo-generated files on Windows) and rejects ".." path traversal, and "cmd/cgo" and "cmd/link" reject PE imported DLL names containing path separators, "..", ":", or leading "-" or "@".