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Tool Directory

CVE-2023-39320

CriticalPublished

Arbitrary code execution via go.mod toolchain directive in cmd/go

Published: Sep 8, 2023
Updated: Feb 13, 2025
Assigning CNA: Go
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

1.8%

Low · next 30 days

Percentile: 76.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The go.mod toolchain directive, introduced in Go 1.21, can be leveraged to execute scripts and binaries relative to the root of the module when the "go" command was executed within the module. This applies to modules downloaded using the "go" command from the module proxy, as well as modules downloaded directly using VCS software.

Sources

cve-2023-39320PoC
Proof-of-concept exploit for CVE-2023-39320, demonstrating the vulnerability and providing exploitation code for security testing and research.

Responsible use

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