CVE-2026-5773

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.

Affected products

Linuxmint, Red Os, Ubuntu, Libcurl

Haxx Curl

< 8.20.0

CVSS 3.1

7.5 HIGH

EPSS

0.6% (46th percentile)

Weakness

CWE-918

NVD status

Analyzed

Published

2026-05-13

No exploit for CVE-2026-5773 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.