CVE-2026-27140highCWE-641

CVE-2026-27140: high-severity vulnerability in Go toolchain cmd/go

Code execution vulnerability in SWIG code generation in cmd/go

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.8epss 0.7%
SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Go toolchain · cmd/go
Related CVEs — Go toolchain cmd/go

In the same product, most dangerous first.

CVE-2020-28367—Arbitrary code execution via the go command with cgo in cmd/goEPSS 2.4%CVE-2020-28366—Arbitrary code execution in go command with cgo in cmd/go and cmd/cgoEPSS 2.3%CVE-2023-39323HIGHArbitrary code execution during build via line directives in cmd/goEPSS 1.9%CVE-2023-29404CRITICALImproper handling of non-optional LDFLAGS in go command with cgo in cmd/goEPSS 1.8%CVE-2023-39320—Arbitrary code execution via go.mod toolchain directive in cmd/goEPSS 1.8%CVE-2023-29405CRITICALImproper sanitization of LDFLAGS with embedded spaces in go command with cgo in cmd/goEPSS 1.7%