# CVE-2026-97033: Unexpected code execution via --sysroot, -target, -isysroot, -Wl,-syslibroot, and -x cgo flags in cmd/go

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

Building a malicious package that uses cgo could cause arbitrary code execution at build time through several compiler and linker flags permitted in "#cgo" directives. Specifically, "--sysroot" in GCC and Clang relocates compiler subprograms, spec files, and CRT startup objects to an attacker-controlled directory; "-target" in Clang falls back to executing target helper tools from the current working directory when not found in PATH; "-isysroot" and "-Wl,-syslibroot" can pass a regular file on disk to GNU ld.bfd, which interprets it as a positional linker script; and "-x" permitted specifying arbitrary compiler input languages beyond those supported by cgo. "--sysroot" and "-target" are now disallowed in "#cgo" flags, "-isysroot" and "-Wl,-syslibroot" are verified not to point to regular files, and "-x" is restricted to the C, C++, Objective-C, and assembler languages supported by cgo.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Go toolchain / cmd/go (cmd/go): ≥ 0; < 1.26.11 (affected, semver); ≥ 1.27.0-0; < 1.27.4 (affected, semver). Source: CNA: Go

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-77

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://go.dev/cl/862146 (CNA: Go)

- https://go.dev/issue/82577 (CNA: Go)

- https://groups.google.com/g/golang-announce/c/iY8TY0wWgbM (CNA: Go)

- https://pkg.go.dev/vuln/GO-2026-6858 (CNA: Go)

## Provenance

- CNA: Go: https://www.cve.org/CVERecord?id=CVE-2026-97033; retrieved 2026-11-11; source updated 2026-11-11

Revision: 9fc18a8b1d34944254217f2e8a98db8a51b7ddce12efb1e99fd0cf37aedde8c8

Canonical: https://y2.dev/cve/CVE-2026-97033

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