An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.
{
"license": "CC-BY-4.0",
"sources": [
{
"id": "CVE-2023-27536",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2023-27536",
"modified": "2026-06-17T05:45:25.680Z",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2023-27536",
"imported": "2026-07-17T20:57:14.528Z",
"published": "2023-03-30T20:15:07.547Z",
"database_specific": {
"status": "Modified"
}
}
]
}