CVE-2023-45285: Command 'go get' may unexpectedly fallback to insecure git in cmd/go

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-06 · updated 2026-06-17

Description

Using go get to fetch a module with the ".git" suffix may unexpectedly fallback to the insecure "git://" protocol if the module is unavailable via the secure "https://" and "git+ssh://" protocols, even if GOINSECURE is not set for said module. This only affects users who are not using the module proxy and are fetching modules directly (i.e. GOPROXY=off).

Affected products

Go: before 1.20.12; from 1.21.0-0 before 1.21.5 — fixed in 1.20.12, 1.21.5

How to fix

Upgrade to a fixed version: Go 1.20.12, 1.21.5. Check the vendor advisory for mitigations.

References

https://go.dev/cl/540257
https://go.dev/issue/63845
https://groups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJ
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UIU6HOGV6RRIKWM57LOXQA75BGZSIH6G/
https://pkg.go.dev/vuln/GO-2023-2383
https://go.dev/cl/540257
https://go.dev/issue/63845
https://groups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJ
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UIU6HOGV6RRIKWM57LOXQA75BGZSIH6G/
https://pkg.go.dev/vuln/GO-2023-2383

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