FTP connection reuse inherits client-certificate
An `ftp://` transfer configured with `CURLUSESSL_NONE` can reuse a pooled FTP control connection that a previous easy handle upgraded with `STARTTLS` and authenticated using a client certificate. The second handle performs neither a new TLS handshake nor a new FTP login, so the server continues to authorize it under the first handle's certificate identity.
CVE-2026-86411
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-86411
curl
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "curl",
"product": "curl",
"versions": [
{
"status": "affected",
"version": "8.21.0",
"versionType": "semver",
"lessThanOrEqual": "8.21.0"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-86411
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #42593 · Revision 1
- Added to Heist Feed
- Publisher date