CVE-2026-94447 (GCVE-0-2026-94447)

Vulnerability from cvelistv5 – Published: 2026-10-08 22:53 – Updated: 2026-10-08 22:53
VLAI
Title
Checksum database bypass for golang.org/toolchain in cmd/go
Summary
Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/toolchain go.sum entry and operates a malicious GOMODPROXY the user chooses to use can bypass the intended checksum. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum.
Severity
No CVSS data available.
CWE
  • CWE-354 - Improper Validation of Integrity Check Value
Assigner
Go CNA under the Google root
CNA scorecard E 42/100 over 75 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Go toolchain cmd/go Affected: 0 , < 1.26.9 (semver)
Affected: 1.27.0-0 , < 1.27.2 (semver)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "cmd/go",
          "product": "cmd/go",
          "vendor": "Go toolchain",
          "versions": [
            {
              "lessThan": "1.26.9",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.2",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/toolchain go.sum entry and operates a malicious GOMODPROXY the user chooses to use can bypass the intended checksum. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-354: Improper Validation of Integrity Check Value",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-08T22:53:57.974Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/840785"
        },
        {
          "url": "https://go.dev/issue/81834"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6602"
        }
      ],
      "title": "Checksum database bypass for golang.org/toolchain in cmd/go"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-94447",
    "datePublished": "2026-10-08T22:53:57.974Z",
    "dateReserved": "2026-09-21T16:43:04.757Z",
    "dateUpdated": "2026-10-08T22:53:57.974Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "collectionURL": "https://pkg.go.dev",
                "defaultStatus": "unaffected",
                "packageName": "cmd/go",
                "product": "cmd/go",
                "vendor": "Go toolchain",
                "versions": [
                  {
                    "lessThan": "1.26.9",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "1.27.2",
                    "status": "affected",
                    "version": "1.27.0-0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "security@golang.org"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/toolchain go.sum entry and operates a malicious GOMODPROXY the user chooses to use can bypass the intended checksum. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum."
          }
        ],
        "id": "CVE-2026-94447",
        "lastModified": "2026-10-08T23:17:05.180",
        "metrics": {},
        "published": "2026-10-08T23:17:05.180",
        "references": [
          {
            "source": "security@golang.org",
            "url": "https://go.dev/cl/840785"
          },
          {
            "source": "security@golang.org",
            "url": "https://go.dev/issue/81834"
          },
          {
            "source": "security@golang.org",
            "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"
          },
          {
            "source": "security@golang.org",
            "url": "https://pkg.go.dev/vuln/GO-2026-6602"
          }
        ],
        "sourceIdentifier": "security@golang.org",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-09T08:39:18+00:00",
      "cve": "CVE-2026-94447",
      "id": "CVE-2026-94447",
      "initial_release_date": "2026-10-08T22:53:57.974000+00:00",
      "product_status:fixed": "17",
      "product_status:known_affected": "37",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "cmd/go: golang: cmd/go: Toolchain checksum verification bypass via crafted project configuration",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94447.json",
      "version": "3"
    }
  }
}



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