CVE-2023-39323

Name: CVE-2023-39323
Creator: NVD / NIST
Published: 2023-10-05T21:15:11.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2023-39323 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Line directives ("//line") can be used to bypass the restrictions on "//go:cgo_" directives, allowing blocked linker and compiler flags to be passed during compilation. This can result in unexpected execution of arbitrary code when running "go build". EPSS estimates a 1.75% chance of exploitation in the next 30 days.

Description

Line directives ("//line") can be used to bypass the restrictions on "//go:cgo_" directives, allowing blocked linker and compiler flags to be passed during compilation. This can result in unexpected execution of arbitrary code when running "go build". The line directive requires the absolute path of the file in which the directive lives, which makes exploiting this issue significantly more complex.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

1.75%

75.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Golang	Go	< 1.20.9
Golang	Go	>= 1.21.0, < 1.21.2
Fedoraproject	Fedora	37
Fedoraproject	Fedora	38
Fedoraproject	Fedora	39

References

https://go.dev/cl/533215Patch
https://go.dev/issue/63211Issue Tracking, Patch
https://groups.google.com/g/golang-announce/c/XBa1oHDevAoMailing List, Release Notes
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CLB4TW7KALB3EEQWNWCN7OUIWWVWWCG2/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSEGD2IWKNUO3DWY4KQGUQM5BISRWHQE/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XFOIBB4YFICHDM7IBOP7PWXW3FX4HLL2/Mailing List, Third Party Advisory
https://pkg.go.dev/vuln/GO-2023-2095Vendor Advisory
https://security.gentoo.org/glsa/202311-09Third Party Advisory
https://security.netapp.com/advisory/ntap-20231020-0001/Third Party Advisory
https://go.dev/cl/533215Patch
https://go.dev/issue/63211Issue Tracking, Patch
https://groups.google.com/g/golang-announce/c/XBa1oHDevAoMailing List, Release Notes
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CLB4TW7KALB3EEQWNWCN7OUIWWVWWCG2/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSEGD2IWKNUO3DWY4KQGUQM5BISRWHQE/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XFOIBB4YFICHDM7IBOP7PWXW3FX4HLL2/Mailing List, Third Party Advisory
https://pkg.go.dev/vuln/GO-2023-2095Vendor Advisory
https://security.gentoo.org/glsa/202311-09Third Party Advisory
https://security.netapp.com/advisory/ntap-20231020-0001/Third Party Advisory

Timeline

Published: Oct 5, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-39323?

How severe is CVE-2023-39323?

CVE-2023-39323 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2023-39323?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-39323?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST