GHSA-JM94-9F7H-36PR

Vulnerability from github – Published: 2026-07-03 09:31 – Updated: 2026-07-03 09:31
VLAI?
Details

When a user invokes curl using a schemeless URL combined with --proto-default sftp (or scp), a disconnect occurs between the tool layer and libcurl. The tool layer incorrectly infers the URL scheme, which erroneously bypasses the initialization of critical SSH security options like CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the libcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes the connection via SFTP/SCP as specified. Because the tool layer skipped the security configuration, these SSH host verification options are silently omitted, causing curl to connect to an unverified SSH remote host without throwing an error.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-12064"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-03T07:16:24Z",
    "severity": null
  },
  "details": "When a user invokes curl using a schemeless URL combined with\n`--proto-default` sftp (or scp), a disconnect occurs between the tool layer\nand libcurl. The tool layer incorrectly infers the URL scheme, which\nerroneously bypasses the initialization of critical SSH security options like\nCURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the\nlibcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes\nthe connection via SFTP/SCP as specified. Because the tool layer skipped the\nsecurity configuration, these SSH host verification options are silently\nomitted, causing curl to connect to an unverified SSH remote host without\nthrowing an error.",
  "id": "GHSA-jm94-9f7h-36pr",
  "modified": "2026-07-03T09:31:26Z",
  "published": "2026-07-03T09:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12064"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3797526"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-12064.html"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-12064.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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