Exposure of Data Element to Wrong Session Affecting curl package, versions [8.21.0,8.23.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CURL-21195758
- published18 Oct 2026
- disclosed14 Oct 2026
- creditUnknown
Introduced: 14 Oct 2026
NewCVE-2026-86411 (opens in a new tab)How to fix?
Upgrade curl to version 8.23.0 or higher.
Overview
curl is a command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP. libcurl offers a myriad of powerful features.
Affected versions of this package are vulnerable to Exposure of Data Element to Wrong Session due to improper reuse of pooled FTP connections previously authenticated with client certificates. An attacker can gain unauthorized access to remote server resources by initiating an unencrypted FTP transfer that reuses a connection originally established with certificate authentication. This is only exploitable if a client application shares a connection pool across both certificate-authenticated FTP sessions and unauthenticated cleartext transfers.