CVE-2026-5773
wrong reuse of SMB connection
libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
| CWE | CWE-488 |
| Vendor | curl |
| Product | curl |
| Published | May 13, 2026 |
| Last Updated | Sep 15, 2026 |
Get instant alerts for curl curl
Be the first to know when new high vulnerabilities affecting curl curl are published — delivered to Slack, Telegram or Discord.