9.8

CVE-2023-39320: Arbitrary code execution via go.mod toolchain directive in cmd/go

Modified
AliasesUBUNTU-CVE-2023-39320CGA-62jj-582g-fq2fCGA-mx5g-34rv-crg9
Published 08-09-2023Last modified 13-02-2025

Vulnerability summary

CVE-2023-39320 is a critical (CVSS 9.8) Improper Control of Generation of Code vulnerability in go toolchain cmd/go. EPSS estimates a 1.76% chance of exploitation in the next 30 days, higher than 77.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.76%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 6
OPENSUSE-SU-2023:0360-1OPENSUSE-SU-2024:13217-1SUSE-SU-2023:3701-1SUSE-SU-2023:4469-1CGA-8J4J-QXH6-9M2PCGA-M5H9-C5W7-CG58

Timeline

  1. 08-09-2023
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

1.76%

Chance of exploitation in the next 30 days

Percentile

78%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.76% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • go≥ 1.21.0, < 1.21.1-r0
Chainguard1 product
  • metrics-server< 0.6.4-r1
Go1 product
  • toolchain≥ 1.21.0-0, < 1.21.1
Go toolchain1 product
Golang1 product
  • go≥ 1.21.0, < 1.21.1
Ubuntu1 product
  • golang-1.21< 1.21.1-1~ubuntu20.04.1 | < 1.21.1-1~ubuntu22.04.1 | < 1.21.5-1
Wolfi1 product
  • metrics-server< 0.6.4-r1

7 vendors · 7 products

References

11 links
Show all 11 references