GO-2026-6849

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Source

https://pkg.go.dev/vuln/GO-2026-6849

Import Source

https://vuln.go.dev/ID/GO-2026-6849.json

JSON Data

https://api.osv.dev/v1/vulns/GO-2026-6849

Aliases

CVE-2026-97042

Published

2026-11-11T02:51:11Z

Modified

2026-11-11T03:15:14Z

Summary

Linker flag injection via cgo_import_dynamic and PE DLL names in cmd/cgo, cmd/compile, and cmd/link

Details

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" 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 "@".

Database specific

{
    "review_status": "REVIEWED",
    "url": "https://pkg.go.dev/vuln/GO-2026-6849"
}

References

Affected packages

Go / toolchain

Package

Name: toolchain; View open source insights on deps.dev
Purl: pkg:golang/toolchain

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.26.11

Introduced

1.27.0-0

Fixed

1.27.4

Ecosystem specific

{
    "imports": [
        {
            "path": "cmd/cgo"
        },
        {
            "path": "cmd/compile"
        },
        {
            "path": "cmd/link"
        }
    ]
}

Database specific

source

"https://vuln.go.dev/ID/GO-2026-6849.json"