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Critical

Improper sanitization of LDFLAGS with embedded spaces in go command with cgo in cmd/go

Type: advisorySources: OSV

The go command may execute arbitrary code at build time when using cgo. This may occur when running "go get" on a malicious module, or when running any other command which builds untrusted code. This is can by triggered by linker flags, specified via a "#cgo LDFLAGS" directive. Flags containing embedded spaces are mishandled, allowing disallowed flags to be smuggled through the LDFLAGS sanitization by including them in the argument of another flag. This only affects usage of the gccgo compiler.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2023-29405
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 00:19 UTC · Revision 1

Source evidence

Improper sanitization of LDFLAGS with embedded spaces in go command with cgo in cmd/go

core-osv · Original source

Published 8 Jun 2023, 20:19 UTC

The go command may execute arbitrary code at build time when using cgo. This may occur when running "go get" on a malicious module, or when running any other command which builds untrusted code. This is can by triggered by linker flags, specified via a "#cgo LDFLAGS" directive. Flags containing embedded spaces are mishandled, allowing disallowed flags to be smuggled through the LDFLAGS sanitization by including them in the argument of another flag. This only affects usage of the gccgo compiler.

osv:CVE-2023-29405
Complete source record
{
  "id": "1f6ded62b31143e01439e81b93528a28e0e56fe4e8aa3174709960c11358704c",
  "url": "https://osv.dev/vulnerability/CVE-2023-29405",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Improper sanitization of LDFLAGS with embedded spaces in go command with cgo in cmd/go",
    "summary": "The go command may execute arbitrary code at build time when using cgo. This may occur when running \"go get\" on a malicious module, or when running any other command which builds untrusted code. This is can by triggered by linker flags, specified via a \"#cgo LDFLAGS\" directive. Flags containing embedded spaces are mishandled, allowing disallowed flags to be smuggled through the LDFLAGS sanitization by including them in the argument of another flag. This only affects usage of the gccgo compiler.",
    "evidence": "osv:CVE-2023-29405",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2023-29405",
      "aliases": [
        "BIT-golang-2023-29405",
        "CVE-2023-29405",
        "GO-2023-1842"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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          "ranges": [
            {
              "repo": "https://github.com/golang/go",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
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                {
                  "fixed": "7fe60b5df764f5a16a2c40e4412b5ed60f709192"
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                {
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              "database_specific": {
                "extracted_events": [
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                    "cpe": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
                    "range": [
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                    "source": "CPE_RANGE"
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                    "range": [
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                        "introduced": "1.20.0"
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-29405.json"
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      "modified": "2026-10-28T02:30:51.957481803Z",
      "provider": "osv",
      "references": [
        "https://go.dev/cl/501224",
        "https://go.dev/issue/60306",
        "https://groups.google.com/g/golang-announce/c/q5135a9d924/m/j0ZoAJOHAwAJ",
        "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NZ2O6YCO2IZMZJELQGZYR2WAUNEDLYV6/",
        "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XBS3IIK6ADV24C5ULQU55QLT2UE762ZX/",
        "https://pkg.go.dev",
        "https://pkg.go.dev/vuln/GO-2023-1842",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/29xxx/CVE-2023-29405.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-29405",
        "https://security.gentoo.org/glsa/202311-09",
        "https://security.netapp.com/advisory/ntap-20241206-0003/"
      ],
      "provider_metadata": {
        "cna_assigner": "Go",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
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                    "fixed": "1.19.10"
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/29xxx/CVE-2023-29405.json"
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      {
        "value": "CVE-2023-29405",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520915,
  "published_at": "2023-06-08T20:19:19.267+00:00"
}