CVE-2023-39323

HIGHNVD 8.19.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-10-05. NVD baseline CVSS 8.1; sources differ by 1.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 8.1Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.1
EG Score
9.8(medium)
EG Risk
—
EPSS
75.7%
KEV
Not listed

Published

October 5, 2023

Last Modified

June 12, 2025

References (18)

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntugolang-1.18-src (1.18.1-1ubuntu1~16.04.6+esm1) @ xenial2026-05-24ubuntu
ubuntugolang-1.21-src (1.21.1-1~ubuntu23.04.2) @ lunar2026-05-24ubuntu
ubuntugolang-1.17-src (1.17.13-3ubuntu1.3) @ jammy2026-05-24ubuntu
redhatubi8/go-toolset:1.20.10-32023-11-16redhat
redhatgo-toolset:rhel8-8090020231013032436.26eb71ac2023-11-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
toolchain—1.21.2—

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-07-22 23:12 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-21 15:23 UTCEPSS rescore
  4. 2026-07-21 15:23 UTCEPSS rescore
  5. 2026-07-20 17:06 UTCEPSS rescore
  6. 2026-07-19 14:29 UTCEPSS rescore
  7. 2026-07-19 02:27 UTCEPSS rescore
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  10. 2026-07-16 17:01 UTCEPSS rescore
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  12. 2026-07-15 16:56 UTCEPSS rescore
  13. 2026-07-15 16:56 UTCEPSS rescore
  14. 2026-07-15 07:49 UTCOSV refresh
  15. 2026-07-15 01:58 UTCEPSS rescore
  16. 2026-07-13 22:28 UTCEPSS rescore
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  24. 2026-07-09 19:08 UTCEPSS rescore
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  1. 2026-07-07 13:44 UTCEPSS rescore
  2. 2026-07-06 16:26 UTCEPSS rescore
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  4. 2026-07-06 02:22 UTCEPSS rescore
  5. 2026-07-05 02:29 UTCEPSS rescore
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  7. 2026-07-01 15:05 UTCEPSS rescore
  8. 2026-06-30 23:21 UTCEPSS rescore
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  10. 2026-06-29 14:05 UTCEPSS rescore
  11. 2026-06-28 14:06 UTCEPSS rescore
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  13. 2026-06-28 04:55 UTCEPSS rescore
  14. 2026-06-28 04:55 UTCEPSS rescore
  15. 2026-06-27 08:34 UTCOSV refresh
  16. 2026-06-27 03:07 UTCEPSS rescore
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  18. 2026-06-25 13:48 UTCEPSS rescore
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  20. 2026-06-24 14:04 UTCEPSS rescore
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  22. 2026-06-23 21:31 UTCEPSS rescore
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  24. 2026-06-22 14:24 UTCEPSS rescore
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  26. 2026-06-21 14:55 UTCEPSS rescore
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  28. 2026-06-21 01:58 UTCEPSS rescore
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  30. 2026-06-19 19:24 UTCEPSS rescore
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  32. 2026-06-18 17:51 UTCEPSS rescore
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  35. 2026-06-16 17:51 UTCEPSS rescore
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  37. 2026-06-15 17:47 UTCEPSS rescore
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  39. 2026-06-14 23:16 UTCEPSS rescore
  40. 2026-06-13 22:59 UTCEPSS rescore
  41. 2026-06-13 22:59 UTCEPSS rescore
  42. 2026-06-12 23:10 UTCEPSS rescore
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  44. 2026-06-11 13:59 UTCEPSS rescore
  45. 2026-06-11 13:59 UTCEPSS rescore
  46. 2026-06-10 22:17 UTCEPSS rescore
  47. 2026-06-10 13:21 UTCEPSS rescore
  48. 2026-06-10 13:21 UTCEPSS rescore
  49. 2026-06-09 18:47 UTCOSV refresh
  50. 2026-06-08 14:16 UTCEPSS rescore
  51. 2026-06-08 14:16 UTCEPSS rescore
  52. 2026-06-07 15:23 UTCEPSS rescore
  53. 2026-06-07 15:23 UTCEPSS rescore
  54. 2026-06-06 13:46 UTCEPSS rescore
  55. 2026-06-06 13:46 UTCEPSS rescore
  56. 2026-06-05 22:46 UTCEPSS rescore
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  58. 2026-06-05 06:09 UTCEPSS rescore
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  60. 2026-06-04 13:11 UTCEPSS rescore
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  62. 2026-06-02 20:12 UTCEPSS rescore
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  65. 2026-06-01 13:51 UTCEPSS rescore
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  67. 2026-05-31 22:30 UTCEPSS rescore
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  70. 2026-05-31 00:15 UTCEPSS rescore
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  72. 2026-05-29 13:43 UTCEPSS rescore
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  74. 2026-05-28 13:43 UTCEPSS rescore
  75. 2026-05-28 13:43 UTCEPSS rescore

Frequently asked(5)

What is CVE-2023-39323?
CVE-2023-39323 is a high vulnerability published on October 5, 2023. 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…
When was CVE-2023-39323 disclosed?
CVE-2023-39323 was first published in the National Vulnerability Database on October 5, 2023, with the most recent update on June 12, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-39323 actively exploited?
CVE-2023-39323 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-39323?
CVE-2023-39323 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2023-39323?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39323, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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