CVE-2023-39320
CWE-94Published: September 8, 2023· Updated: Jun 17, 2026
Official Description
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.
Risk Analysis
The Go toolchain contains a flaw where the go.mod directive can be exploited to execute arbitrary scripts or binaries during module processing. This critical vulnerability allows for remote code execution with a CVSS score of 9.8.
There is no known public exploit for this vulnerability, and it is not in CISA KEV. It is remotely exploitable with low attack complexity.
Ensure the Go environment is updated to a version that includes the fix for this toolchain vulnerability.
Technical Analysis
CVE-2023-39320 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (12)
Quick Facts
Related CVEs (CWE-94)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-39320 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts