Insertion of Sensitive Information Into Sent Data Affecting curl package, versions [8.21.0,8.23.0)
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- published18 Oct 2026
- disclosed14 Oct 2026
- creditUnknown
Introduced: 14 Oct 2026
NewCVE-2026-86413 (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 Insertion of Sensitive Information Into Sent Data via the Negotiate authentication process when configured to follow HTTP redirects using system-provided Kerberos credentials. An attacker can obtain sensitive authentication data by redirecting a client to a secondary URL containing embedded credentials. This is only exploitable if the client is configured to use Negotiate authentication with ambient Kerberos credentials and is set to follow redirects to a destination with embedded credentials.