curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.
{
"license": "CC-BY-4.0",
"sources": [
{
"modified": "2026-06-17T03:37:55.703Z",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-22876",
"imported": "2026-07-17T20:52:43.297Z",
"database_specific": {
"status": "Modified"
},
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22876",
"published": "2021-04-01T18:15:12.823Z",
"id": "CVE-2021-22876"
}
]
}